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Roman Italy is the period of ancient Italian history going from the founding and rise of
Rome Rome (Italian language, Italian and , ) is the capital city and most populated (municipality) of Italy. It is also the administrative centre of the Lazio Regions of Italy, region and of the Metropolitan City of Rome. A special named with 2, ...
to the decline and
fall of the Western Roman Empire The fall of the Western Roman Empire, also called the fall of the Roman Empire or the fall of Rome, was the loss of central political control in the Western Roman Empire, a process in which the Empire failed to enforce its rule, and its vast ...
; the
Latin Latin ( or ) is a classical language belonging to the Italic languages, Italic branch of the Indo-European languages. Latin was originally spoken by the Latins (Italic tribe), Latins in Latium (now known as Lazio), the lower Tiber area aroun ...
name of the Italian peninsula in this period was ''Italia'' (continued to be used in the
Italian language Italian (, , or , ) is a Romance language of the Indo-European language family. It evolved from the colloquial Latin of the Roman Empire. Italian is the least divergent language from Latin, together with Sardinian language, Sardinian. It is ...
)."Roman Italy"
''
Encyclopædia Britannica The is a general knowledge, general-knowledge English-language encyclopaedia. It has been published by Encyclopædia Britannica, Inc. since 1768, although the company has changed ownership seven times. The 2010 version of the 15th edition, ...
.'' May 2025
According to
Roman mythology Roman mythology is the body of myths of ancient Rome as represented in the literature and visual arts of the Romans, and is a form of Roman folklore. "Roman mythology" may also refer to the modern study of these representations, and to th ...
, Italy was the ancestral home of
Aeneas In Greco-Roman mythology, Aeneas ( , ; from ) was a Troy, Trojan hero, the son of the Trojan prince Anchises and the Greek goddess Aphrodite (equivalent to the Roman Venus (mythology), Venus). His father was a first cousin of King Priam of Troy ...
, being the homeland of the Trojans progenitor, Dardanus; Aeneas, instructed by
Jupiter Jupiter is the fifth planet from the Sun and the List of Solar System objects by size, largest in the Solar System. It is a gas giant with a Jupiter mass, mass more than 2.5 times that of all the other planets in the Solar System combined a ...
, moved to Italy after the
fall of Troy The Trojan War was a legendary conflict in Greek mythology that took place around the twelfth or thirteenth century BC. The war was waged by the Achaeans (Greeks) against the city of Troy after Paris of Troy took Helen from her husband Me ...
, and his descendants,
Romulus and Remus In Roman mythology, Romulus and (, ) are twins in mythology, twin brothers whose story tells of the events that led to the Founding of Rome, founding of the History of Rome, city of Rome and the Roman Kingdom by Romulus, following his frat ...
, were the founders of Rome. Aside from the legendary accounts, Rome was an Italic city-state that changed its form of government from Kingdom (ruled, between 753 BC and 509 BC, by seven kings) to
Republic A republic, based on the Latin phrase ''res publica'' ('public affair' or 'people's affair'), is a State (polity), state in which Power (social and political), political power rests with the public (people), typically through their Representat ...
, and then grew within the context of a peninsula dominated by the
Gauls The Gauls (; , ''Galátai'') were a group of Celts, Celtic peoples of mainland Europe in the Iron Age Europe, Iron Age and the Roman Gaul, Roman period (roughly 5th century BC to 5th century AD). Their homeland was known as Gaul (''Gallia''). Th ...
,
Ligures The Ligures or Ligurians were an ancient people after whom Liguria, a region of present-day Northern Italy, north-western Italy, is named. Because of the strong Celts, Celtic influences on their language and culture, they were also known in anti ...
, Veneti,
Camunni The Camuni or Camunni were an ancient population located in Val Camonica during the Iron Age (1st millennium BC); the Latin name ''Camunni'' was attributed to them by the authors of the 1st century. They are also called ancient Camuni, to disting ...
and Histri in the
North North is one of the four compass points or cardinal directions. It is the opposite of south and is perpendicular to east and west. ''North'' is a noun, adjective, or adverb indicating Direction (geometry), direction or geography. Etymology T ...
; the
Etruscans The Etruscan civilization ( ) was an ancient civilization created by the Etruscans, a people who inhabited Etruria in List of ancient peoples of Italy, ancient Italy, with a common language and culture, and formed a federation of city-states. Af ...
,
Latins The term Latins has been used throughout history to refer to various peoples, ethnicities and religious groups using Latin or the Latin-derived Romance languages, as part of the legacy of the Roman Empire. In the Ancient World, it referred to th ...
,
Falisci The Falisci were an Italic peoples, Italic tribe who lived in what is now northern Lazio, on the Etruscan side of the Tiber River. They spoke an Italic languages, Italic language, Faliscan language, Faliscan, closely related to Latin. Origina ...
,
Picentes The Picentes or Piceni or Picentini were an ancient Italic peoples, Italic people who lived from the 9th to the 3rd century BC in the area between the Foglia and Aterno rivers, bordered to the west by the Apennines and to the east by the Adriatic ...
,
Umbri The Umbri were an Italic peoples, Italic people of ancient Italy. A region called Umbria still exists and is now occupied by Italian speakers. It is somewhat smaller than the Regio VI Umbria, ancient Umbria. Most ancient Umbrian cities were sett ...
and
Sabines The Sabines (, , , ;  ) were an Italic people who lived in the central Apennine Mountains (see Sabina) of the ancient Italian Peninsula, also inhabiting Latium north of the Anio before the founding of Rome. The Sabines divided int ...
in the
Centre Center or centre may refer to: Mathematics *Center (geometry), the middle of an object * Center (algebra), used in various contexts ** Center (group theory) ** Center (ring theory) * Graph center, the set of all vertices of minimum eccentricity ...
; and the Iapygian tribes (such as the
Messapians The Messapians were an Iapygian tribe who inhabited Salento in classical antiquity. Two other Iapygian tribes, the Peucetians and the Daunians, inhabited central and northern Apulia respectively. All three tribes spoke the Messapian language, ...
), the
Oscan Oscan is an extinct Indo-European language of southern Italy. The language is in the Osco-Umbrian or Sabellic branch of the Italic languages. Oscan is therefore a close relative of Umbrian and South Picene. Oscan was spoken by a number of t ...
tribes (such as the
Samnites The Samnites () were an ancient Italic peoples, Italic people who lived in Samnium, which is located in modern inland Abruzzo, Molise, and Campania in south-central Italy. An Oscan language, Oscan-speaking Osci, people, who originated as an offsh ...
) and
Greek Greek may refer to: Anything of, from, or related to Greece, a country in Southern Europe: *Greeks, an ethnic group *Greek language, a branch of the Indo-European language family **Proto-Greek language, the assumed last common ancestor of all kno ...
colonies in the
South South is one of the cardinal directions or compass points. The direction is the opposite of north and is perpendicular to both west and east. Etymology The word ''south'' comes from Old English ''sūþ'', from earlier Proto-Germanic ''*sunþa ...
. The consolidation of Italy into a single entity occurred during the Roman expansion in the peninsula, when Rome formed a permanent association with most of other the local tribes and cities; and Italy's inhabitants included
Roman citizens Citizenship in ancient Rome () was a privileged political and legal status afforded to free individuals with respect to laws, property, and governance. Citizenship in ancient Rome was complex and based upon many different laws, traditions, and cu ...
, communities with
Latin Rights Latin rights or Latin citizenship ( or ) were a set of legal rights that were originally granted to the Latins and therefore in their colonies ( Latium adiectum). ''Latinitas'' was commonly used by Roman jurists to denote this status. With the ...
, and
socii The ''socii'' ( ) or ''foederati'' ( ) were confederates of ancient Rome, Rome and formed one of the three legal denominations in Roman Italy (''Italia'') along with the core Roman citizens (''Cives Romani'') and the extended ''Latin Rights, Lat ...
. The strength of the Italian confederacy was a crucial factor in the
rise of Rome The Roman Republic ( ) was the era of classical Roman civilisation beginning with the overthrow of the Roman Kingdom (traditionally dated to 509 BC) and ending in 27 BC with the establishment of the Roman Empire following the War ...
, starting with the
Punic The Punic people, usually known as the Carthaginians (and sometimes as Western Phoenicians), were a Semitic people who migrated from Phoenicia to the Western Mediterranean during the Early Iron Age. In modern scholarship, the term ''Punic'' ...
and Macedonian wars between the 3rd and 2nd century BC. As
Roman provinces The Roman provinces (, pl. ) were the administrative regions of Ancient Rome outside Roman Italy that were controlled by the Romans under the Roman Republic and later the Roman Empire. Each province was ruled by a Roman appointed as gover ...
were being established throughout the Mediterranean, Italy maintained a special status with political, religious and financial privileges. In Italy, Roman magistrates exercised the (police power), as an alternative to the (military power) exercised in the provinces. The period between the end of the 2nd century BC and the 1st century BC was
turbulent In fluid dynamics, turbulence or turbulent flow is fluid motion characterized by chaotic changes in pressure and flow velocity. It is in contrast to laminar flow, which occurs when a fluid flows in parallel layers with no disruption between ...
, beginning with the
Servile Wars The Servile Wars were a series of three slave revolts ("servile" is derived from ''servus'', Latin for "slave") in the late Roman Republic: * First Servile War (135−132 BC) — in Sicily, led by Eunus, a former slave claiming to be a prophet, ...
, continuing with the opposition of aristocratic élite to populist reformers and leading to a Social War in the middle of Italy. However,
Roman citizenship Citizenship in ancient Rome () was a privileged political and legal status afforded to free individuals with respect to laws, property, and governance. Citizenship in ancient Rome was complex and based upon many different laws, traditions, and cu ...
was recognized to the rest of the Italians by the end of the conflict and then extended to
Cisalpine Gaul Cisalpine Gaul (, also called ''Gallia Citerior'' or ''Gallia Togata'') was the name given, especially during the 4th and 3rd centuries BC, to a region of land inhabited by Celts (Gauls), corresponding to what is now most of northern Italy. Afte ...
when
Julius Caesar Gaius Julius Caesar (12 or 13 July 100 BC – 15 March 44 BC) was a Roman general and statesman. A member of the First Triumvirate, Caesar led the Roman armies in the Gallic Wars before defeating his political rival Pompey in Caesar's civil wa ...
became
Roman dictator A Roman dictator was an extraordinary Roman magistrate, magistrate in the Roman Republic endowed with full authority to resolve some specific problem to which he had been assigned. He received the full powers of the state, subordinating the oth ...
. In the context of the transition from Republic to Principate, Italy swore allegiance to
Augustus Gaius Julius Caesar Augustus (born Gaius Octavius; 23 September 63 BC – 19 August AD 14), also known as Octavian (), was the founder of the Roman Empire, who reigned as the first Roman emperor from 27 BC until his death in A ...
and was then organized in eleven regions from the
Alps The Alps () are some of the highest and most extensive mountain ranges in Europe, stretching approximately across eight Alpine countries (from west to east): Monaco, France, Switzerland, Italy, Liechtenstein, Germany, Austria and Slovenia. ...
to the
Ionian Sea The Ionian Sea (, ; or , ; , ) is an elongated bay of the Mediterranean Sea. It is connected to the Adriatic Sea to the north, and is bounded by Southern Italy, including Basilicata, Calabria, Sicily, and the Salento peninsula to the west, ...
with more than two centuries of stability afterward. Several emperors made notable accomplishments in this period:
Claudius Tiberius Claudius Caesar Augustus Germanicus ( ; ; 1 August 10 BC – 13 October AD 54), or Claudius, was a Roman emperor, ruling from AD 41 to 54. A member of the Julio-Claudian dynasty, Claudius was born to Nero Claudius Drusus, Drusus and Ant ...
incorporated Britain into the Roman Empire,
Vespasian Vespasian (; ; 17 November AD 9 – 23 June 79) was Roman emperor from 69 to 79. The last emperor to reign in the Year of the Four Emperors, he founded the Flavian dynasty, which ruled the Empire for 27 years. His fiscal reforms and consolida ...
subjugated the Great Revolt of Judea and reformed the financial system,
Trajan Trajan ( ; born Marcus Ulpius Traianus, 18 September 53) was a Roman emperor from AD 98 to 117, remembered as the second of the Five Good Emperors of the Nerva–Antonine dynasty. He was a philanthropic ruler and a successful soldier ...
conquered
Dacia Dacia (, ; ) was the land inhabited by the Dacians, its core in Transylvania, stretching to the Danube in the south, the Black Sea in the east, and the Tisza in the west. The Carpathian Mountains were located in the middle of Dacia. It thus ro ...
and defeated
Parthia Parthia ( ''Parθava''; ''Parθaw''; ''Pahlaw'') is a historical region located in northeastern Greater Iran. It was conquered and subjugated by the empire of the Medes during the 7th century BC, was incorporated into the subsequent Achaemeni ...
, and
Marcus Aurelius Marcus Aurelius Antoninus ( ; ; 26 April 121 – 17 March 180) was Roman emperor from 161 to 180 and a Stoicism, Stoic philosopher. He was a member of the Nerva–Antonine dynasty, the last of the rulers later known as the Five Good Emperors ...
epitomized the ideal of the
philosopher king The philosopher king is a hypothetical ruler in whom political skill is combined with philosophical knowledge. The concept of a city-state ruled by philosophers is first explored in Plato's ''Republic'', written around 375 BC. Plato argued that ...
. With the development of provincial governments and the proliferation of citizenship, Italy gradually lost its position as the empire's heartland, though it retained the ideological value as Roman
homeland A homeland is a place where a national or ethnic identity has formed. The definition can also mean simply one's country of birth. When used as a proper noun, the Homeland, as well as its equivalents in other languages, often has ethnic natio ...
. The
Crisis of the Third Century The Crisis of the Third Century, also known as the Military Anarchy or the Imperial Crisis, was a period in History of Rome, Roman history during which the Roman Empire nearly collapsed under the combined pressure of repeated Barbarian invasions ...
hit Italy particularly hard, but the Roman Empire managed to survive and reconquer breakaway regions. In 286 AD, the Emperor
Diocletian Diocletian ( ; ; ; 242/245 – 311/312), nicknamed Jovius, was Roman emperor from 284 until his abdication in 305. He was born Diocles to a family of low status in the Roman province of Dalmatia (Roman province), Dalmatia. As with other Illyri ...
moved the imperial residence associated with the western territories (the later
Western Roman Empire In modern historiography, the Western Roman Empire was the western provinces of the Roman Empire, collectively, during any period in which they were administered separately from the eastern provinces by a separate, independent imperial court. ...
) from Rome to
Mediolanum Mediolanum, the ancient city where Milan now stands, was originally an Insubres, Insubrian city, but afterwards became an important Ancient Rome, Roman city in Northern Italy. The city was settled by a Celts, Celtic tribe belonging to the Ins ...
. In 293 AD, Diocletian subdivided Italy into
provinces A province is an administrative division within a country or state. The term derives from the ancient Roman , which was the major territorial and administrative unit of the Roman Empire's territorial possessions outside Italy. The term ''provi ...
and ended its special juridical privileges, which led to the loss of Italy's precedence over provinces. Meanwhile, the islands of
Corsica Corsica ( , , ; ; ) is an island in the Mediterranean Sea and one of the Regions of France, 18 regions of France. It is the List of islands in the Mediterranean#By area, fourth-largest island in the Mediterranean and lies southeast of the Metro ...
,
Sardinia Sardinia ( ; ; ) is the Mediterranean islands#By area, second-largest island in the Mediterranean Sea, after Sicily, and one of the Regions of Italy, twenty regions of Italy. It is located west of the Italian Peninsula, north of Tunisia an ...
,
Sicily Sicily (Italian language, Italian and ), officially the Sicilian Region (), is an island in the central Mediterranean Sea, south of the Italian Peninsula in continental Europe and is one of the 20 regions of Italy, regions of Italy. With 4. ...
and
Malta Malta, officially the Republic of Malta, is an island country in Southern Europe located in the Mediterranean Sea, between Sicily and North Africa. It consists of an archipelago south of Italy, east of Tunisia, and north of Libya. The two ...
were added to Italy by
Diocletian Diocletian ( ; ; ; 242/245 – 311/312), nicknamed Jovius, was Roman emperor from 284 until his abdication in 305. He was born Diocles to a family of low status in the Roman province of Dalmatia (Roman province), Dalmatia. As with other Illyri ...
. The city of Rome declined as the center of power as new capitals were established outside Italy, such as
Nicomedia Nicomedia (; , ''Nikomedeia''; modern İzmit) was an ancient Greece, ancient Greek city located in what is now Turkey. In 286, Nicomedia became the eastern and most senior capital city of the Roman Empire (chosen by the emperor Diocletian who rul ...
,
Sirmium Sirmium was a city in the Roman province of Pannonia, located on the Sava river, on the site of modern Sremska Mitrovica in the Vojvodina autonomous province of Serbia. First mentioned in the 4th century BC and originally inhabited by Illyrians ...
, and later
Constantinople Constantinople (#Names of Constantinople, see other names) was a historical city located on the Bosporus that served as the capital of the Roman Empire, Roman, Byzantine Empire, Byzantine, Latin Empire, Latin, and Ottoman Empire, Ottoman empire ...
. However, Italy remained the centre of the Western Roman Empire in
late antiquity Late antiquity marks the period that comes after the end of classical antiquity and stretches into the onset of the Early Middle Ages. Late antiquity as a period was popularized by Peter Brown (historian), Peter Brown in 1971, and this periodiza ...
. Italian cities such as Mediolanum,
Ravenna Ravenna ( ; , also ; ) is the capital city of the Province of Ravenna, in the Emilia-Romagna region of Northern Italy. It was the capital city of the Western Roman Empire during the 5th century until its Fall of Rome, collapse in 476, after which ...
and Rome continued to serve as capitals for the West. The
Bishop of Rome The pope is the bishop of Rome and the visible head of the worldwide Catholic Church. He is also known as the supreme pontiff, Roman pontiff, or sovereign pontiff. From the 8th century until 1870, the pope was the sovereign or head of sta ...
had gained importance gradually from the reign of
Constantine the Great Constantine I (27 February 27222 May 337), also known as Constantine the Great, was a Roman emperor from AD 306 to 337 and the first Roman emperor to convert to Christianity. He played a Constantine the Great and Christianity, pivotal ro ...
, and was given religious primacy with the
Edict of Thessalonica An edict is a decree or announcement of a law, often associated with monarchies, but it can be under any official authority. Synonyms include "dictum" and "pronouncement". ''Edict'' derives from the Latin wikt:edictum#Latin, edictum. Notable ed ...
under
Theodosius I Theodosius I ( ; 11 January 347 – 17 January 395), also known as Theodosius the Great, was Roman emperor from 379 to 395. He won two civil wars and was instrumental in establishing the Nicene Creed as the orthodox doctrine for Nicene C ...
. Italy was invaded several times by the wandering Germanic peoples and fell under the control of
Odoacer Odoacer ( – 15 March 493 AD), also spelled Odovacer or Odovacar, was a barbarian soldier and statesman from the Middle Danube who deposed the Western Roman child emperor Romulus Augustulus and became the ruler of Italy (476–493). Odoacer' ...
, when Romulus Augustus was deposed in 476 AD. Afterwards, Italy was ruled by the
Ostrogoths The Ostrogoths () were a Roman-era Germanic peoples, Germanic people. In the 5th century, they followed the Visigoths in creating one of the two great Goths, Gothic kingdoms within the Western Roman Empire, drawing upon the large Gothic populatio ...
and then briefly reconquered by the
Byzantine Empire The Byzantine Empire, also known as the Eastern Roman Empire, was the continuation of the Roman Empire centred on Constantinople during late antiquity and the Middle Ages. Having survived History of the Roman Empire, the events that caused the ...
. The Lombard invasion in 568 AD would begin the fragmentation of Italy which lasted until its unification in 1861.


Characteristics

Following the end of the Social War in 87 BC, Rome had allowed its fellow Italian allies full rights in Roman society and granted
Roman citizenship Citizenship in ancient Rome () was a privileged political and legal status afforded to free individuals with respect to laws, property, and governance. Citizenship in ancient Rome was complex and based upon many different laws, traditions, and cu ...
to all fellow
Italic peoples The concept of Italic peoples is widely used in linguistics and historiography of ancient Italy. In a strict sense, commonly used in linguistics, it refers to the Osco-Umbrian languages, Osco-Umbrians and Latino-Faliscan languages, Latino-Falisca ...
. After having been for centuries the heart of the
Roman Empire The Roman Empire ruled the Mediterranean and much of Europe, Western Asia and North Africa. The Roman people, Romans conquered most of this during the Roman Republic, Republic, and it was ruled by emperors following Octavian's assumption of ...
, from the 3rd century the government and the cultural center began to move eastward: first the Edict of Caracalla in 212 AD, extended Roman citizenship to all free men within the Imperial boundaries.
Christianity Christianity is an Abrahamic monotheistic religion, which states that Jesus in Christianity, Jesus is the Son of God (Christianity), Son of God and Resurrection of Jesus, rose from the dead after his Crucifixion of Jesus, crucifixion, whose ...
then began to establish itself as the dominant religion from Constantine's reign (306–337), raising the power of Eastern metropolises, later grouped into
Pentarchy Pentarchy (, ) was a model of Church organization formulated in the laws of Emperor Justinian I () of the Roman Empire. In this model, the Christian Church is governed by the heads (patriarchs) of the five major episcopal sees of the Roman Em ...
. Although not founded as a capital city in 330,
Constantinople Constantinople (#Names of Constantinople, see other names) was a historical city located on the Bosporus that served as the capital of the Roman Empire, Roman, Byzantine Empire, Byzantine, Latin Empire, Latin, and Ottoman Empire, Ottoman empire ...
grew in importance. It finally gained the rank of eastern capital when given an ''
praefectus urbi The ''praefectus urbanus'', also called ''praefectus urbi'' or urban prefect in English, was prefect of the city of Rome, and later also of Constantinople. The office originated under the Roman kings, continued during the Republic and Empire, an ...
'' in 359 and the senators who were ''clari'' became senators of the lowest rank as '' clarissimi''. As a result, Italy began to decline in favour of the provinces, which resulted in the division of the Empire into two administrative units in 395: the
Western Roman Empire In modern historiography, the Western Roman Empire was the western provinces of the Roman Empire, collectively, during any period in which they were administered separately from the eastern provinces by a separate, independent imperial court. ...
, with its capital at
Mediolanum Mediolanum, the ancient city where Milan now stands, was originally an Insubres, Insubrian city, but afterwards became an important Ancient Rome, Roman city in Northern Italy. The city was settled by a Celts, Celtic tribe belonging to the Ins ...
(now
Milan Milan ( , , ; ) is a city in northern Italy, regional capital of Lombardy, the largest city in Italy by urban area and the List of cities in Italy, second-most-populous city proper in Italy after Rome. The city proper has a population of nea ...
), and the
Eastern Roman Empire The Byzantine Empire, also known as the Eastern Roman Empire, was the continuation of the Roman Empire centred on Constantinople during late antiquity and the Middle Ages. Having survived the events that caused the fall of the Western Roman E ...
, with its capital at
Constantinople Constantinople (#Names of Constantinople, see other names) was a historical city located on the Bosporus that served as the capital of the Roman Empire, Roman, Byzantine Empire, Byzantine, Latin Empire, Latin, and Ottoman Empire, Ottoman empire ...
(now
Istanbul Istanbul is the List of largest cities and towns in Turkey, largest city in Turkey, constituting the country's economic, cultural, and historical heart. With Demographics of Istanbul, a population over , it is home to 18% of the Demographics ...
). In 402, the Imperial residence was moved to
Ravenna Ravenna ( ; , also ; ) is the capital city of the Province of Ravenna, in the Emilia-Romagna region of Northern Italy. It was the capital city of the Western Roman Empire during the 5th century until its Fall of Rome, collapse in 476, after which ...
from Milan, confirming the decline of the city of Rome (which was sacked in 410 for the first time in almost eight centuries).


History

The name ''Italia'' covered an area whose borders evolved over time. According to
Strabo Strabo''Strabo'' (meaning "squinty", as in strabismus) was a term employed by the Romans for anyone whose eyes were distorted or deformed. The father of Pompey was called "Gnaeus Pompeius Strabo, Pompeius Strabo". A native of Sicily so clear-si ...
's ''
Geographica The ''Geographica'' (, ''Geōgraphiká''; or , "Strabo's 17 Books on Geographical Topics") or ''Geography'', is an encyclopedia of geographical knowledge, consisting of 17 'books', written in Greek in the late 1st century BC, or early 1st cen ...
'', before the expansion of the
Roman Republic The Roman Republic ( ) was the era of Ancient Rome, classical Roman civilisation beginning with Overthrow of the Roman monarchy, the overthrow of the Roman Kingdom (traditionally dated to 509 BC) and ending in 27 BC with the establis ...
, the name was used by Greeks to indicate the land between the
strait of Messina The Strait of Messina (; ) is a narrow strait between the eastern tip of Sicily (Punta del Faro) and the western tip of Calabria (Punta Pezzo) in Southern Italy. It connects the Tyrrhenian Sea to the north with the Ionian Sea to the south, with ...
and the line connecting the
gulf of Salerno The Gulf of Salerno (Italian language, Italian: ''Golfo di Salerno'') is a gulf of the Tyrrhenian Sea in the coast of the province of Salerno in south-western Italy. The northern part of this coast is the Costiera Amalfitana, which ends at Punt ...
and
gulf of Taranto The Gulf of Taranto (; Tarantino: ; ) is a gulf of the Ionian Sea, in Southern Italy. The Gulf of Taranto is almost square, long and wide, making it the largest gulf in Italy, and it is delimited by the capes Santa Maria di Leuca (to the eas ...
(corresponding roughly to the current region of
Calabria Calabria is a Regions of Italy, region in Southern Italy. It is a peninsula bordered by the region Basilicata to the north, the Ionian Sea to the east, the Strait of Messina to the southwest, which separates it from Sicily, and the Tyrrhenian S ...
); later the term was extended by Romans to include the Italian Peninsula up to the
Rubicon The Rubicon (; ; ) is a shallow river in northeastern Italy, just south of Cesena and north of Rimini. It was known as ''Fiumicino'' until 1933, when it was identified with the ancient river Rubicon, crossed by Julius Caesar in 49 BC. The ri ...
, a river located between Northern and
Central Italy Central Italy ( or ) is one of the five official statistical regions of Italy used by the National Institute of Statistics (ISTAT), a first-level NUTS region with code ITI, and a European Parliament constituency. It has 11,704,312 inhabita ...
. In 49 BC, with the ''
Lex Roscia The ''Lex Roscia'' was introduced in 49 BC by the praetor Lucius Roscius Fabatus on behalf of Julius Caesar. It granted Roman citizenship to the populations in Transpadana, the area of Cisalpine Gaul north of the River Po. In 89 BC, these people ...
'',
Julius Caesar Gaius Julius Caesar (12 or 13 July 100 BC – 15 March 44 BC) was a Roman general and statesman. A member of the First Triumvirate, Caesar led the Roman armies in the Gallic Wars before defeating his political rival Pompey in Caesar's civil wa ...
gave Roman citizenship to the people of the
Cisalpine Gaul Cisalpine Gaul (, also called ''Gallia Citerior'' or ''Gallia Togata'') was the name given, especially during the 4th and 3rd centuries BC, to a region of land inhabited by Celts (Gauls), corresponding to what is now most of northern Italy. Afte ...
; while in 42 BC the hitherto existing province was abolished, thus extending Italy to the north up to the southern foot of the
Alps The Alps () are some of the highest and most extensive mountain ranges in Europe, stretching approximately across eight Alpine countries (from west to east): Monaco, France, Switzerland, Italy, Liechtenstein, Germany, Austria and Slovenia. ...
. Under Augustus, the peoples of today's
Aosta Valley The Aosta Valley ( ; ; ; or ), officially the Autonomous Region of Aosta Valley, is a mountainous Regions of Italy#Autonomous regions with special statute, autonomous region in northwestern Italy. It is bordered by Auvergne-Rhône-Alpes, Fr ...
and of the western and northern Alps were subjugated (so the western border of Roman Italy was moved to the Varus river), and the Italian eastern border was brought to the Arsia in
Istria Istria ( ; Croatian language, Croatian and Slovene language, Slovene: ; Italian language, Italian and Venetian language, Venetian: ; ; Istro-Romanian language, Istro-Romanian: ; ; ) is the largest peninsula within the Adriatic Sea. Located at th ...
. Lastly, in the late 3rd century, Italy came to also include the islands of
Sicily Sicily (Italian language, Italian and ), officially the Sicilian Region (), is an island in the central Mediterranean Sea, south of the Italian Peninsula in continental Europe and is one of the 20 regions of Italy, regions of Italy. With 4. ...
, Corsica and Sardinia, as well as
Raetia Raetia or Rhaetia ( , ) was a province of the Roman Empire named after the Rhaetian people. It bordered on the west with the country of the Helvetii, on the east with Noricum, on the north with Vindelicia, on the south-west with Transalpine ...
and part of
Pannonia Pannonia (, ) was a Roman province, province of the Roman Empire bounded on the north and east by the Danube, on the west by Noricum and upper Roman Italy, Italy, and on the southward by Dalmatia (Roman province), Dalmatia and upper Moesia. It ...
. The city of
Emona Emona (early ) or Aemona (short for ) was a Roman castrum, located in the area where the navigable Nauportus River came closest to Castle Hill,Ljubljana {{Infobox settlement , name = Ljubljana , official_name = , settlement_type = Capital city , image_skyline = {{multiple image , border = infobox , perrow = 1/2/2/1 , total_widt ...
, Slovenia) was the easternmost town of Italy.


Augustan organization

At the beginning of the Roman Imperial era, Italy was a collection of territories with different political statuses. Some cities, called ''
municipia In ancient Rome, the Latin term (: ) referred to a town or city. Etymologically, the was a social contract among ('duty holders'), or citizens of the town. The duties () were a communal obligation assumed by the in exchange for the privileges ...
'', had some independence from Rome, while others, the '' coloniae'', were founded by the Romans themselves. Around 7 BC,
Augustus Gaius Julius Caesar Augustus (born Gaius Octavius; 23 September 63 BC – 19 August AD 14), also known as Octavian (), was the founder of the Roman Empire, who reigned as the first Roman emperor from 27 BC until his death in A ...
divided Italy into eleven ''regiones'', as reported by
Pliny the Elder Gaius Plinius Secundus (AD 23/24 79), known in English as Pliny the Elder ( ), was a Roman Empire, Roman author, Natural history, naturalist, and naval and army commander of the early Roman Empire, and a friend of the Roman emperor, emperor Vesp ...
in his ''
Naturalis Historia The ''Natural History'' () is a Latin work by Pliny the Elder. The largest single work to have survived from the Roman Empire to the modern day, the ''Natural History'' compiles information gleaned from other ancient authors. Despite the work' ...
'': * Regio I ''
Latium Latium ( , ; ) is the region of central western Italy in which the city of Rome was founded and grew to be the capital city of the Roman Empire. Definition Latium was originally a small triangle of fertile, volcanic soil (Old Latium) on whic ...
et
Campania Campania is an administrative Regions of Italy, region of Italy located in Southern Italy; most of it is in the south-western portion of the Italian Peninsula (with the Tyrrhenian Sea to its west), but it also includes the small Phlegraean Islan ...
'' * Regio II ''
Apulia Apulia ( ), also known by its Italian language, Italian name Puglia (), is a Regions of Italy, region of Italy, located in the Southern Italy, southern peninsular section of the country, bordering the Adriatic Sea to the east, the Strait of Ot ...
et
Calabria Calabria is a Regions of Italy, region in Southern Italy. It is a peninsula bordered by the region Basilicata to the north, the Ionian Sea to the east, the Strait of Messina to the southwest, which separates it from Sicily, and the Tyrrhenian S ...
'' * Regio III ''
Lucania Lucania was a historical region of Southern Italy, corresponding to the modern-day region of Basilicata. It was the land of the Lucani, an Oscan people. It extended from the Tyrrhenian Sea to the Gulf of Taranto. It bordered with Samnium and ...
et
Bruttium 01 or 01 may refer to: * The year 2001, or any year ending with 01 * The month of January * 1 (number) Music * ''01'' (Richard Müller album), 2001 * ''01'' (Urban Zakapa album), 2011 * ''01011001'', the seventh studio album from Arjen Anthony L ...
'' * Regio IV ''
Samnium Samnium () is a Latin exonym for a region of Southern Italy anciently inhabited by the Samnites. Their own endonyms were ''Safinim'' for the country (attested in one inscription and one coin legend) and ''Safineis'' for the The language of t ...
'' * Regio V ''
Picenum Picenum was a region of ancient Italy. The name was assigned by the Romans, who conquered and incorporated it into the Roman Republic. Picenum became ''Regio V'' in the Augustan territorial organisation of Roman Italy. It is now in Marche ...
'' * Regio VI '' Umbria et Ager Gallicus'' * Regio VII ''
Etruria Etruria ( ) was a region of Central Italy delimited by the rivers Arno and Tiber, an area that covered what is now most of Tuscany, northern Lazio, and north-western Umbria. It was inhabited by the Etruscans, an ancient civilization that f ...
'' * Regio VIII '' Aemilia'' * Regio IX ''
Liguria Liguria (; ; , ) is a Regions of Italy, region of north-western Italy; its Capital city, capital is Genoa. Its territory is crossed by the Alps and the Apennine Mountains, Apennines Mountain chain, mountain range and is roughly coextensive with ...
'' * Regio X '' Venetia et Histria'' * Regio XI '' Transpadana'' Italy was privileged by Augustus and his heirs, with the construction, among other public structures, of a dense network of
Roman roads Roman roads ( ; singular: ; meaning "Roman way") were physical infrastructure vital to the maintenance and development of the Roman state, built from about 300 BC through the expansion and consolidation of the Roman Republic and the Roman Em ...
. The Italian economy flourished: agriculture, handicraft and industry had noticeable growth, allowing the export of goods to the provinces. The Italian population may have grown as well: three censuses were ordered by Augustus, in his role as
Roman censor The censor was a magistrate in ancient Rome who was responsible for maintaining the census, supervising public morality, and overseeing certain aspects of the government's finances. Established under the Roman Republic, power of the censor was lim ...
, in order to record the number of Roman citizens throughout the empire. The surviving totals were 4,063,000 in 28 BC, 4,233,000 in 8 BC, and 4,937,000 in AD 14, but it is still debated whether these counted all citizens, all adult male citizens, or citizens ''
sui iuris ''Sui iuris'' (), also spelled ''sui juris'', is a Latin phrase that literally means "of one's own right". It is used in both the Catholic Church's canon law and secular law. The term church ''sui iuris'' is used in the Catholic ''Code of Canon ...
''. Estimates for the population of mainland Italy, including Cisalpine Gaul, at the beginning of the 1st century range from 6,000,000 according to Karl Julius Beloch in 1886, to 14,000,000 according to Elio Lo Cascio in 2009.


Diocletianic and Constantinian reorganizations

During the
Crisis of the Third Century The Crisis of the Third Century, also known as the Military Anarchy or the Imperial Crisis, was a period in History of Rome, Roman history during which the Roman Empire nearly collapsed under the combined pressure of repeated Barbarian invasions ...
, the Roman Empire was on the verge of disintegration under the combined pressures of invasions, military anarchy, civil wars, and hyperinflation. In 284, Emperor
Diocletian Diocletian ( ; ; ; 242/245 – 311/312), nicknamed Jovius, was Roman emperor from 284 until his abdication in 305. He was born Diocles to a family of low status in the Roman province of Dalmatia (Roman province), Dalmatia. As with other Illyri ...
restored political stability. He carried out thorough administrative reforms to maintain order. He created the so-called
Tetrarchy The Tetrarchy was the system instituted by Roman emperor Diocletian in 293 AD to govern the ancient Roman Empire by dividing it between two emperors, the ''augusti'', and their junior colleagues and designated successors, the ''caesares''. I ...
whereby the empire was ruled by two senior emperors called Augusti and two junior vice-emperors called Caesars. He decreased the size of the
Roman province The Roman provinces (, pl. ) were the administrative regions of Ancient Rome outside Roman Italy that were controlled by the Romans under the Roman Republic and later the Roman Empire. Each province was ruled by a Roman appointed as Roman g ...
s by doubling their number to reduce the power of the provincial governors. He grouped the provinces into several
dioceses In Ecclesiastical polity, church governance, a diocese or bishopric is the ecclesiastical district under the jurisdiction of a bishop. History In the later organization of the Roman Empire, the increasingly subdivided Roman province, prov ...
(Latin: diocesis) and put them under the supervision of the Imperial
vicarius ''Vicarius'' is a Latin word, meaning ''substitute'' or ''deputy''. It is the root of the English word "vicar". History Originally, in ancient Rome, this office was equivalent to the later English " vice-" (as in " deputy"), used as part of th ...
(vice, deputy), who was the head of the diocese. During the Crisis of the Third Century the importance of Rome declined because the city was far from the troubled frontiers. Diocletian and his colleagues usually resided in four Imperial seats. The Augusti, Diocletian and
Maximian Maximian (; ), nicknamed Herculius, was Roman emperor from 286 to 305. He was ''Caesar (title), Caesar'' from 285 to 286, then ''Augustus (title), Augustus'' from 286 to 305. He shared the latter title with his co-emperor and superior, Diocleti ...
, who were responsible for the East and West respectively, established themselves at
Nicomedia Nicomedia (; , ''Nikomedeia''; modern İzmit) was an ancient Greece, ancient Greek city located in what is now Turkey. In 286, Nicomedia became the eastern and most senior capital city of the Roman Empire (chosen by the emperor Diocletian who rul ...
, in north-western
Anatolia Anatolia (), also known as Asia Minor, is a peninsula in West Asia that makes up the majority of the land area of Turkey. It is the westernmost protrusion of Asia and is geographically bounded by the Mediterranean Sea to the south, the Aegean ...
(closer to the Persian frontier in the east) and
Milan Milan ( , , ; ) is a city in northern Italy, regional capital of Lombardy, the largest city in Italy by urban area and the List of cities in Italy, second-most-populous city proper in Italy after Rome. The city proper has a population of nea ...
, in northern Italy (closer to the European frontiers) respectively. The seats of the Caesars were
Augusta Treverorum Augusta Treverorum (Latin for "City of Augustus in the Land of the Treveri") was a Ancient Rome, Roman city on the Moselle River, from which modern Trier emerged. The date of the city's founding is placed between the construction of the first Rom ...
(on the River
Rhine The Rhine ( ) is one of the List of rivers of Europe, major rivers in Europe. The river begins in the Swiss canton of Graubünden in the southeastern Swiss Alps. It forms part of the Swiss-Liechtenstein border, then part of the Austria–Swit ...
frontier) for
Constantius Chlorus Flavius Valerius Constantius ( – 25 July 306), also called Constantius I, was a Roman emperor from 305 to 306. He was one of the four original members of the Tetrarchy established by Diocletian, first serving as Caesar (title), ''caesar'' ...
and
Sirmium Sirmium was a city in the Roman province of Pannonia, located on the Sava river, on the site of modern Sremska Mitrovica in the Vojvodina autonomous province of Serbia. First mentioned in the 4th century BC and originally inhabited by Illyrians ...
(on the River
Danube The Danube ( ; see also #Names and etymology, other names) is the List of rivers of Europe#Longest rivers, second-longest river in Europe, after the Volga in Russia. It flows through Central and Southeastern Europe, from the Black Forest sou ...
frontier) for
Galerius Galerius Valerius Maximianus (; Greek: Γαλέριος; 258 – May 311) was Roman emperor from 305 to 311. He participated in the system of government later known as the Tetrarchy, first acting as '' caesar'' under Emperor Diocletian. In th ...
, who also resided at Thessaloniki. Under Diocletian Italy became the Dioecesis Italiciana. It included
Raetia Raetia or Rhaetia ( , ) was a province of the Roman Empire named after the Rhaetian people. It bordered on the west with the country of the Helvetii, on the east with Noricum, on the north with Vindelicia, on the south-west with Transalpine ...
. It was subdivided into the following provinces: * ''Liguria'' (today's
Liguria Liguria (; ; , ) is a Regions of Italy, region of north-western Italy; its Capital city, capital is Genoa. Its territory is crossed by the Alps and the Apennine Mountains, Apennines Mountain chain, mountain range and is roughly coextensive with ...
and western
Piedmont Piedmont ( ; ; ) is one of the 20 regions of Italy, located in the northwest Italy, Northwest of the country. It borders the Liguria region to the south, the Lombardy and Emilia-Romagna regions to the east, and the Aosta Valley region to the ...
) * ''Transpadana'' (eastern Piedmont and
Lombardy The Lombardy Region (; ) is an administrative regions of Italy, region of Italy that covers ; it is located in northern Italy and has a population of about 10 million people, constituting more than one-sixth of Italy's population. Lombardy is ...
(except Provincia di Brescia)) * ''Rhaetia'' (eastern Switzerland, western and central Austria, part of southern Germany, and part of northeastern Italy) * ''Venetia et Histria'' (today's Provincia di Brescia in
Lombardy The Lombardy Region (; ) is an administrative regions of Italy, region of Italy that covers ; it is located in northern Italy and has a population of about 10 million people, constituting more than one-sixth of Italy's population. Lombardy is ...
,
Veneto Veneto, officially the Region of Veneto, is one of the 20 regions of Italy, located in the Northeast Italy, north-east of the country. It is the fourth most populous region in Italy, with a population of 4,851,851 as of 2025. Venice is t ...
,
Friuli-Venezia Giulia Friuli-Venezia Giulia () is one of the 20 regions of Italy and one of five autonomous regions with special statute. The regional capital is Trieste on the Gulf of Trieste, a bay of the Adriatic Sea. Friuli-Venezia Giulia has an area of and a ...
and Trentino-Alto Adige and
Istria county Istria County (; ; , "Istrian Region") is the westernmost Counties of Croatia, county of Croatia which includes the majority of the Istrian peninsula. Administrative centers in the county are Pazin, Pula and Poreč. Istria County has the larg ...
) * ''Aemilia'' (
Emilia-Romagna Emilia-Romagna (, , both , ; or ; ) is an Regions of Italy, administrative region of northern Italy, comprising the historical regions of Emilia (region), Emilia and Romagna. Its capital is Bologna. It has an area of , and a population of 4.4 m ...
) * ''Tuscia'' (
Etruria Etruria ( ) was a region of Central Italy delimited by the rivers Arno and Tiber, an area that covered what is now most of Tuscany, northern Lazio, and north-western Umbria. It was inhabited by the Etruscans, an ancient civilization that f ...
) ''et Umbria'' (
Tuscany Tuscany ( ; ) is a Regions of Italy, region in central Italy with an area of about and a population of 3,660,834 inhabitants as of 2025. The capital city is Florence. Tuscany is known for its landscapes, history, artistic legacy, and its in ...
and
Umbria Umbria ( ; ) is a Regions of Italy, region of central Italy. It includes Lake Trasimeno and Cascata delle Marmore, Marmore Falls, and is crossed by the Tiber. It is the only landlocked region on the Italian Peninsula, Apennine Peninsula. The re ...
) * ''Flaminia'' (
Picenum Picenum was a region of ancient Italy. The name was assigned by the Romans, who conquered and incorporated it into the Roman Republic. Picenum became ''Regio V'' in the Augustan territorial organisation of Roman Italy. It is now in Marche ...
and the former Ager Gallicus, in today's
Marche Marche ( ; ), in English sometimes referred to as the Marches ( ) from the Italian name of the region (Le Marche), is one of the Regions of Italy, twenty regions of Italy. The region is located in the Central Italy, central area of the country, ...
) * ''Latium et Campania'' (the coastal parts of
Lazio Lazio ( , ; ) or Latium ( , ; from Latium, the original Latin name, ) is one of the 20 Regions of Italy, administrative regions of Italy. Situated in the Central Italy, central peninsular section of the country, it has 5,714,882 inhabitants an ...
and
Campania Campania is an administrative Regions of Italy, region of Italy located in Southern Italy; most of it is in the south-western portion of the Italian Peninsula (with the Tyrrhenian Sea to its west), but it also includes the small Phlegraean Islan ...
) * ''Samnium'' (
Abruzzo Abruzzo (, ; ; , ''Abbrìzze'' or ''Abbrèzze'' ; ), historically also known as Abruzzi, is a Regions of Italy, region of Southern Italy with an area of 10,763 square km (4,156 sq mi) and a population of 1.3 million. It is divided into four ...
,
Molise Molise ( , ; ; , ) is a Regions of Italy, region in Southern Italy. Until 1963, it formed part of the region of Abruzzi e Molise together with Abruzzo. The split, which did not become effective until 1970, makes Molise the newest region in Ital ...
and Irpinia) * ''Apulia et Calabria'' (today's
Apulia Apulia ( ), also known by its Italian language, Italian name Puglia (), is a Regions of Italy, region of Italy, located in the Southern Italy, southern peninsular section of the country, bordering the Adriatic Sea to the east, the Strait of Ot ...
) * ''Lucania et Bruttium'' (
Basilicata Basilicata (, ; ), also known by its ancient name Lucania (, , ), is an administrative region in Southern Italy, bordering on Campania to the west, Apulia to the north and east, and Calabria to the south. It has two coastlines: a 30-kilometr ...
and
Calabria Calabria is a Regions of Italy, region in Southern Italy. It is a peninsula bordered by the region Basilicata to the north, the Ionian Sea to the east, the Strait of Messina to the southwest, which separates it from Sicily, and the Tyrrhenian S ...
) * ''Sicilia'' (
Sicily Sicily (Italian language, Italian and ), officially the Sicilian Region (), is an island in the central Mediterranean Sea, south of the Italian Peninsula in continental Europe and is one of the 20 regions of Italy, regions of Italy. With 4. ...
and
Malta Malta, officially the Republic of Malta, is an island country in Southern Europe located in the Mediterranean Sea, between Sicily and North Africa. It consists of an archipelago south of Italy, east of Tunisia, and north of Libya. The two ...
) * ''
Corsica et Sardinia The Province of Sardinia and Corsica () was an ancient Roman province including the islands of Sardinia and Corsica. Pre-Roman times The Nuragic civilization flourished in Sardinia from 1800 to 500 BC. The ancient Sardinians, also known as ...
'' Constantine subdivided the Empire into four
praetorian prefecture The praetorian prefecture (; in Ancient Greek, Greek variously named ) was the largest administrative division of the Late Antiquity, late Roman Empire, above the mid-level Roman diocese, dioceses and the low-level Roman province, provinces. Praeto ...
s. The ''Diocesis Italiciana'' became the
Praetorian prefecture of Italy The praetorian prefecture of Italy (, in its full form (until 356) ) was one of four praetorian prefectures into which the Late Roman Empire was divided since the first half of the 4th century. It comprised the Italian peninsula, the western Balk ...
(''praefectura praetoria Italiae''), and was subdivided into two dioceses. It still included
Raetia Raetia or Rhaetia ( , ) was a province of the Roman Empire named after the Rhaetian people. It bordered on the west with the country of the Helvetii, on the east with Noricum, on the north with Vindelicia, on the south-west with Transalpine ...
. The two dioceses and their provinces were: Diocesis Italia annonaria (Italy of the annona - its inhabitants had the obligation to provide the court, the administration and the troops, first allocated in Milan and then in Ravenna, supplies, wine and timber) * ''Alpes Cottiae'' (modern
Liguria Liguria (; ; , ) is a Regions of Italy, region of north-western Italy; its Capital city, capital is Genoa. Its territory is crossed by the Alps and the Apennine Mountains, Apennines Mountain chain, mountain range and is roughly coextensive with ...
and western part of
Piedmont Piedmont ( ; ; ) is one of the 20 regions of Italy, located in the northwest Italy, Northwest of the country. It borders the Liguria region to the south, the Lombardy and Emilia-Romagna regions to the east, and the Aosta Valley region to the ...
) * ''Liguria'' (western
Lombardy The Lombardy Region (; ) is an administrative regions of Italy, region of Italy that covers ; it is located in northern Italy and has a population of about 10 million people, constituting more than one-sixth of Italy's population. Lombardy is ...
and eastern part of Piedmont) * ''Venetia et Histria'' (
Istria Istria ( ; Croatian language, Croatian and Slovene language, Slovene: ; Italian language, Italian and Venetian language, Venetian: ; ; Istro-Romanian language, Istro-Romanian: ; ; ) is the largest peninsula within the Adriatic Sea. Located at th ...
hich is now part of Croatia, Slovenia">Croatia.html" ;"title="hich is now part of Croatia">hich is now part of Croatia, Slovenia and Italy],
Friuli-Venezia Giulia Friuli-Venezia Giulia () is one of the 20 regions of Italy and one of five autonomous regions with special statute. The regional capital is Trieste on the Gulf of Trieste, a bay of the Adriatic Sea. Friuli-Venezia Giulia has an area of and a ...
, Trentino-Alto Adige,
Veneto Veneto, officially the Region of Veneto, is one of the 20 regions of Italy, located in the Northeast Italy, north-east of the country. It is the fourth most populous region in Italy, with a population of 4,851,851 as of 2025. Venice is t ...
and eastern and central Lombardy) * ''Raetia I'' (eastern Switzerland and western Austria) * ''Rhaetia II'' (central Austria, part of southern Germany, and part of northeastern Italy) * ''Aemilia'' (the Emilia part of
Emilia-Romagna Emilia-Romagna (, , both , ; or ; ) is an Regions of Italy, administrative region of northern Italy, comprising the historical regions of Emilia (region), Emilia and Romagna. Its capital is Bologna. It has an area of , and a population of 4.4 m ...
) * ''Flaminia et Picenum Annonarium'' (
Romagna Romagna () is an Italian historical region that approximately corresponds to the south-eastern portion of present-day Emilia-Romagna, in northern Italy. Etymology The name ''Romagna'' originates from the Latin name ''Romania'', which originally ...
and northern
Marche Marche ( ; ), in English sometimes referred to as the Marches ( ) from the Italian name of the region (Le Marche), is one of the Regions of Italy, twenty regions of Italy. The region is located in the Central Italy, central area of the country, ...
) Diocesis Italia suburbicaria (Italy "under the government of the '' urbs''", i.e. Rome) * ''Tuscia'' (
Etruria Etruria ( ) was a region of Central Italy delimited by the rivers Arno and Tiber, an area that covered what is now most of Tuscany, northern Lazio, and north-western Umbria. It was inhabited by the Etruscans, an ancient civilization that f ...
) ''et Umbria'' (
Tuscany Tuscany ( ; ) is a Regions of Italy, region in central Italy with an area of about and a population of 3,660,834 inhabitants as of 2025. The capital city is Florence. Tuscany is known for its landscapes, history, artistic legacy, and its in ...
,
Umbria Umbria ( ; ) is a Regions of Italy, region of central Italy. It includes Lake Trasimeno and Cascata delle Marmore, Marmore Falls, and is crossed by the Tiber. It is the only landlocked region on the Italian Peninsula, Apennine Peninsula. The re ...
and the northern part of coastal
Lazio Lazio ( , ; ) or Latium ( , ; from Latium, the original Latin name, ) is one of the 20 Regions of Italy, administrative regions of Italy. Situated in the Central Italy, central peninsular section of the country, it has 5,714,882 inhabitants an ...
) * ''Picenum suburbicarium'' ( Piceno, in southern
Marche Marche ( ; ), in English sometimes referred to as the Marches ( ) from the Italian name of the region (Le Marche), is one of the Regions of Italy, twenty regions of Italy. The region is located in the Central Italy, central area of the country, ...
) * ''Valeria'' Sabina (the modern
province of Rieti The province of Rieti () is a Provinces of Italy, province in the Lazio region of Italy. Its capital is the city of Rieti. Established in 1927, it has an area of with a total population of 157,887 people as of 2017. There are 73 ''comuni'' (: '' ...
, other areas of Lazio and areas of
Umbria Umbria ( ; ) is a Regions of Italy, region of central Italy. It includes Lake Trasimeno and Cascata delle Marmore, Marmore Falls, and is crossed by the Tiber. It is the only landlocked region on the Italian Peninsula, Apennine Peninsula. The re ...
and
Abruzzo Abruzzo (, ; ; , ''Abbrìzze'' or ''Abbrèzze'' ; ), historically also known as Abruzzi, is a Regions of Italy, region of Southern Italy with an area of 10,763 square km (4,156 sq mi) and a population of 1.3 million. It is divided into four ...
) * ''Campania'' (central and southern coastal
Lazio Lazio ( , ; ) or Latium ( , ; from Latium, the original Latin name, ) is one of the 20 Regions of Italy, administrative regions of Italy. Situated in the Central Italy, central peninsular section of the country, it has 5,714,882 inhabitants an ...
and coastal
Campania Campania is an administrative Regions of Italy, region of Italy located in Southern Italy; most of it is in the south-western portion of the Italian Peninsula (with the Tyrrhenian Sea to its west), but it also includes the small Phlegraean Islan ...
except for the modern
province of Salerno The province of Salerno () is a province in the Campania region of Italy. It has 1,054,766 inhabitants as of 2025. Geography The largest towns in the province are: Salerno, the capital, which has a population of 131,950; Cava de' Tirreni, Bat ...
) * ''Samnium'' (
Abruzzo Abruzzo (, ; ; , ''Abbrìzze'' or ''Abbrèzze'' ; ), historically also known as Abruzzi, is a Regions of Italy, region of Southern Italy with an area of 10,763 square km (4,156 sq mi) and a population of 1.3 million. It is divided into four ...
,
Molise Molise ( , ; ; , ) is a Regions of Italy, region in Southern Italy. Until 1963, it formed part of the region of Abruzzi e Molise together with Abruzzo. The split, which did not become effective until 1970, makes Molise the newest region in Ital ...
and the mountain areas of modern Campania; i.e., the modern provinces of
Benevento Benevento ( ; , ; ) is a city and (municipality) of Campania, Italy, capital of the province of Benevento, northeast of Naples. It is situated on a hill above sea level at the confluence of the Calore Irpino (or Beneventano) and the Sabato (r ...
and
Avellino Avellino () is a city and ''comune'', capital of the province of Avellino in the Campania region of southern Italy. It is situated in a plain surrounded by mountains east of Naples and is an important hub on the road from Salerno to Benevento. ...
and part of the province of Caserta) * ''Apulia et Calabria'' (today's
Apulia Apulia ( ), also known by its Italian language, Italian name Puglia (), is a Regions of Italy, region of Italy, located in the Southern Italy, southern peninsular section of the country, bordering the Adriatic Sea to the east, the Strait of Ot ...
) * ''Lucania et Bruttium (''modern
Calabria Calabria is a Regions of Italy, region in Southern Italy. It is a peninsula bordered by the region Basilicata to the north, the Ionian Sea to the east, the Strait of Messina to the southwest, which separates it from Sicily, and the Tyrrhenian S ...
,
Basilicata Basilicata (, ; ), also known by its ancient name Lucania (, , ), is an administrative region in Southern Italy, bordering on Campania to the west, Apulia to the north and east, and Calabria to the south. It has two coastlines: a 30-kilometr ...
and the
province of Salerno The province of Salerno () is a province in the Campania region of Italy. It has 1,054,766 inhabitants as of 2025. Geography The largest towns in the province are: Salerno, the capital, which has a population of 131,950; Cava de' Tirreni, Bat ...
in modern Campania) * ''Sicilia'' (
Sicily Sicily (Italian language, Italian and ), officially the Sicilian Region (), is an island in the central Mediterranean Sea, south of the Italian Peninsula in continental Europe and is one of the 20 regions of Italy, regions of Italy. With 4. ...
and
Malta Malta, officially the Republic of Malta, is an island country in Southern Europe located in the Mediterranean Sea, between Sicily and North Africa. It consists of an archipelago south of Italy, east of Tunisia, and north of Libya. The two ...
) * ''
Sardinia Sardinia ( ; ; ) is the Mediterranean islands#By area, second-largest island in the Mediterranean Sea, after Sicily, and one of the Regions of Italy, twenty regions of Italy. It is located west of the Italian Peninsula, north of Tunisia an ...
'' * ''
Corsica Corsica ( , , ; ; ) is an island in the Mediterranean Sea and one of the Regions of France, 18 regions of France. It is the List of islands in the Mediterranean#By area, fourth-largest island in the Mediterranean and lies southeast of the Metro ...
''


Late Antiquity

In 330, Constantine completed the rebuilding of Byzantium as
Constantinople Constantinople (#Names of Constantinople, see other names) was a historical city located on the Bosporus that served as the capital of the Roman Empire, Roman, Byzantine Empire, Byzantine, Latin Empire, Latin, and Ottoman Empire, Ottoman empire ...
. He established the Imperial court, a Senate, financial and judicial administrations, as well as the military structures. The new city, however, did not receive an urban prefect until 359 which raised it to the status of eastern capital. After the death of Theodosius in 395 and the subsequent division of the Empire, Italy was home base of the
Western Roman Empire In modern historiography, the Western Roman Empire was the western provinces of the Roman Empire, collectively, during any period in which they were administered separately from the eastern provinces by a separate, independent imperial court. ...
. As a result of Alaric's invasion in 402 the western seat was moved from
Mediolanum Mediolanum, the ancient city where Milan now stands, was originally an Insubres, Insubrian city, but afterwards became an important Ancient Rome, Roman city in Northern Italy. The city was settled by a Celts, Celtic tribe belonging to the Ins ...
to
Ravenna Ravenna ( ; , also ; ) is the capital city of the Province of Ravenna, in the Emilia-Romagna region of Northern Italy. It was the capital city of the Western Roman Empire during the 5th century until its Fall of Rome, collapse in 476, after which ...
. Alaric, king of
Visigoth The Visigoths (; ) were a Germanic people united under the rule of a king and living within the Roman Empire during late antiquity. The Visigoths first appeared in the Balkans, as a Roman-allied barbarian military group united under the comman ...
s, sacked Rome itself in 410; something that had not happened for eight centuries. Northern Italy was attacked by
Attila Attila ( or ; ), frequently called Attila the Hun, was the ruler of the Huns from 434 until his death in early 453. He was also the leader of an empire consisting of Huns, Ostrogoths, Alans, and Gepids, among others, in Central Europe, C ...
's
Huns The Huns were a nomadic people who lived in Central Asia, the Caucasus, and Eastern Europe between the 4th and 6th centuries AD. According to European tradition, they were first reported living east of the Volga River, in an area that was par ...
in 452. Rome was sacked in 455 again by the
Vandals The Vandals were a Germanic people who were first reported in the written records as inhabitants of what is now Poland, during the period of the Roman Empire. Much later, in the fifth century, a group of Vandals led by kings established Vand ...
under the command of Genseric. According to ''
Notitia Dignitatum The (Latin for 'List of all dignities and administrations both civil and military') is a document of the Late Roman Empire that details the administrative organization of the Western and the Eastern Roman Empire. It is unique as one of very ...
'', one of the very few surviving documents of Roman government updated to the 420s, Roman Italy was governed by a
praetorian prefect The praetorian prefect (; ) was a high office in the Roman Empire. Originating as the commander of the Praetorian Guard, the office gradually acquired extensive legal and administrative functions, with its holders becoming the Emperor's chief ai ...
, '' Prefectus praetorio Italiae'' (who also governed the
Diocese of Africa The Diocese of Africa () was a diocese of the later Roman Empire, incorporating the provinces of North Africa, except Mauretania Tingitana. Its seat was at Carthage, and it was subordinate to the Praetorian prefecture of Italy. The diocese in ...
and the
Diocese of Pannonia In church governance, a diocese or bishopric is the ecclesiastical district under the jurisdiction of a bishop. History In the later organization of the Roman Empire, the increasingly subdivided provinces were administratively associate ...
), one ''
vicarius ''Vicarius'' is a Latin word, meaning ''substitute'' or ''deputy''. It is the root of the English word "vicar". History Originally, in ancient Rome, this office was equivalent to the later English " vice-" (as in " deputy"), used as part of th ...
'', and one '' comes rei militaris''. The regions of Italy were governed at the end of the fourth century by eight '' consulares'' (''Venetiae et Histriae'', ''Aemiliae'', ''Liguriae'', ''Flaminiae et Piceni annonarii'', ''Tusciae et Umbriae'', ''Piceni suburbicarii'', ''Campaniae'', and ''Siciliae''), two ''
corrector A corrector (English plural ''correctors'', Latin plural ''correctores'') is a person or object practicing correction, usually by removing or rectifying errors. The word is originally a Roman title, ''corrector'', derived from the Latin verb ' ...
es'' (''Apuliae et Calabriae'' and ''Lucaniae et Bruttiorum'') and seven '' praesides'' (''Alpium Cottiarum'', ''Rhaetia Prima'' and ''Secunda'', ''Samnii'', ''Valeriae'', ''Sardiniae'', and ''Corsicae''). In the fifth century, with the Emperors controlled by their barbarian generals, the Western Imperial government maintained weak control over Italy itself, whose coasts were periodically under attack. In 476, with the abdication of
Romulus Augustulus Romulus Augustus (after 511), nicknamed Augustulus, was Roman emperor of the Western Roman Empire, West from 31 October 475 until 4 September 476. Romulus was placed on the imperial throne while still a minor by his father Orestes (father of Ro ...
, the Western Roman Empire had formally fallen unless one considers
Julius Nepos Julius Nepos (died 9 May 480), or simply Nepos, ruled as Roman emperor of the West from 24 June 474 to 28 August 475. After losing power in Italy, Nepos retreated to his home province of Dalmatia, from which he continued to claim the western i ...
, the legitimate emperor recognized by Constantinople as the last. He was assassinated in 480 and may have been recognized by Odoacer. Italy remained under
Odoacer Odoacer ( – 15 March 493 AD), also spelled Odovacer or Odovacar, was a barbarian soldier and statesman from the Middle Danube who deposed the Western Roman child emperor Romulus Augustulus and became the ruler of Italy (476–493). Odoacer' ...
and his
Kingdom of Italy The Kingdom of Italy (, ) was a unitary state that existed from 17 March 1861, when Victor Emmanuel II of Kingdom of Sardinia, Sardinia was proclamation of the Kingdom of Italy, proclaimed King of Italy, until 10 June 1946, when the monarchy wa ...
, and then under the
Ostrogothic Kingdom The Ostrogothic Kingdom, officially the Kingdom of Italy (), was a barbarian kingdom established by the Germanic Ostrogoths that controlled Italian peninsula, Italy and neighbouring areas between 493 and 553. Led by Theodoric the Great, the Ost ...
. The Germanic successor states under
Odoacer Odoacer ( – 15 March 493 AD), also spelled Odovacer or Odovacar, was a barbarian soldier and statesman from the Middle Danube who deposed the Western Roman child emperor Romulus Augustulus and became the ruler of Italy (476–493). Odoacer' ...
and
Theodoric the Great Theodoric (or Theoderic) the Great (454 – 30 August 526), also called Theodoric the Amal, was king of the Ostrogoths (475–526), and ruler of the independent Ostrogothic Kingdom of Italy between 493 and 526, regent of the Visigoths (511–526 ...
continued to use the Roman administrative apparatus, as well as being nominal subjects of the Eastern emperor at
Constantinople Constantinople (#Names of Constantinople, see other names) was a historical city located on the Bosporus that served as the capital of the Roman Empire, Roman, Byzantine Empire, Byzantine, Latin Empire, Latin, and Ottoman Empire, Ottoman empire ...
. In 535 Roman Emperor
Justinian Justinian I (, ; 48214 November 565), also known as Justinian the Great, was Roman emperor from 527 to 565. His reign was marked by the ambitious but only partly realized ''renovatio imperii'', or "restoration of the Empire". This ambition was ...
invaded Italy which suffered twenty years of disastrous war. In August 554, Justinian issued a
Pragmatic sanction A pragmatic sanction is a sovereign's solemn decree on a matter of primary importance and has the force of fundamental law. In the late history of the Holy Roman Empire, it referred more specifically to an edict issued by the Emperor. When used ...
which maintained most of the organization of
Diocletian Diocletian ( ; ; ; 242/245 – 311/312), nicknamed Jovius, was Roman emperor from 284 until his abdication in 305. He was born Diocles to a family of low status in the Roman province of Dalmatia (Roman province), Dalmatia. As with other Illyri ...
. The "Prefecture of Italy" thus survived, and was reestablished under Roman control in the course of
Justinian Justinian I (, ; 48214 November 565), also known as Justinian the Great, was Roman emperor from 527 to 565. His reign was marked by the ambitious but only partly realized ''renovatio imperii'', or "restoration of the Empire". This ambition was ...
's Gothic War. As a result of the Lombard invasion in 568, the Byzantines lost most of Italy, except the territories of the
Exarchate of Ravenna The Exarchate of Ravenna (; ), also known as the Exarchate of Italy, was an administrative district of the Byzantine Empire comprising, between the 6th and 8th centuries, the territories under the jurisdiction of the exarch of Italy (''exarchus ...
– a corridor from Venice to Lazio via Perugia – and footholds in the south Naples and the toe and heel of the peninsula. With the
Longobards The Lombards () or Longobards () were a Germanic people who conquered most of the Italian Peninsula between 568 and 774. The medieval Lombard historian Paul the Deacon wrote in the '' History of the Lombards'' (written between 787 and 796) t ...
started the division of Italy, that lasted until 1861.


References


Further reading

* * * * * * * * * *


External links

*
Geographical regions in Roman history: Italy
{{coord, 42.0000, N, 12.5000, E, source:wikidata, display=title States and territories established in the 4th century BC States and territories established in the 3rd century BC States and territories disestablished in the 5th century 4th-century BC establishments in the Roman Republic 3rd-century BC establishments in the Roman Republic 470s disestablishments in the Roman Empire Ancient Italian history