Lothair I (9th. C.
Frankish: ''Ludher'' and
Medieval Latin
Medieval Latin was the form of Literary Latin used in Roman Catholic Church, Roman Catholic Western Europe during the Middle Ages. It was also the administrative language in the former Western Roman Empire, Roman Provinces of Mauretania, Numidi ...
: ''Lodharius'';
Dutch and
Medieval Latin
Medieval Latin was the form of Literary Latin used in Roman Catholic Church, Roman Catholic Western Europe during the Middle Ages. It was also the administrative language in the former Western Roman Empire, Roman Provinces of Mauretania, Numidi ...
: ''Lotharius'';
German: ''Lothar'';
French: ''Lothaire'';
Italian: ''Lotario''; 795 – 29 September 855) was a 9th-century
emperor of the Carolingian empire (817–855, with his father until 840) and
king of Italy (818–855) and
Middle Francia (843–855).
Lothair I was the eldest son of the Carolingian emperor
Louis I and his wife
Ermengarde of Hesbaye,
daughter of
Ingerman the duke of
Hesbaye. On several occasions, Lothair led his full-brothers
Pepin I of Aquitaine and
Louis the German in revolt against their father to protest against attempts to make their half-brother
Charles the Bald
Charles the Bald (; 13 June 823 – 6 October 877), also known as CharlesII, was a 9th-century king of West Francia (843–877), King of Italy (875–877) and emperor of the Carolingian Empire (875–877). After a series of civil wars during t ...
a co-heir to the Frankish domains. Upon the father's death, Charles and Louis joined forces against Lothair in
a three-year dynastic war (840–843). The struggles between the brothers led directly to the breakup of the
Frankish Empire assembled by their grandfather
Charlemagne
Charlemagne ( ; 2 April 748 – 28 January 814) was List of Frankish kings, King of the Franks from 768, List of kings of the Lombards, King of the Lombards from 774, and Holy Roman Emperor, Emperor of what is now known as the Carolingian ...
, and laid the foundation for the development of modern
France
France, officially the French Republic, is a country located primarily in Western Europe. Overseas France, Its overseas regions and territories include French Guiana in South America, Saint Pierre and Miquelon in the Atlantic Ocean#North Atlan ...
and
Germany
Germany, officially the Federal Republic of Germany, is a country in Central Europe. It lies between the Baltic Sea and the North Sea to the north and the Alps to the south. Its sixteen States of Germany, constituent states have a total popu ...
.
Early life and reign
Lothair was born in 795, to Louis the Pious and Ermengarde of Hesbaye. His father was the son of the reigning Emperor,
Charlemagne
Charlemagne ( ; 2 April 748 – 28 January 814) was List of Frankish kings, King of the Franks from 768, List of kings of the Lombards, King of the Lombards from 774, and Holy Roman Emperor, Emperor of what is now known as the Carolingian ...
. At the time of Lothair's birth, his father Louis was already the
King of Aquitaine. Little is known of Lothair's early life, which was probably passed at the courts of his father and grandfather. In 814, the elderly emperor died, and left his sole surviving legitimate son Louis the Pious as successor to his vast empire. Being already of age, Lothair was sent to govern
Bavaria
Bavaria, officially the Free State of Bavaria, is a States of Germany, state in the southeast of Germany. With an area of , it is the list of German states by area, largest German state by land area, comprising approximately 1/5 of the total l ...
for his father, the new emperor.
In 817, Louis the Pious drew up his ''
Ordinatio Imperii''. By that act, Louis designated Lothair as his principal heir and ordered that Lothair would be the overlord of Louis' younger sons Pippin of Aquitaine (who was 20) and Louis the German (who was 13), and also the presumptive overlord of the
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 ...
, that was ruled at this time by their cousin, king
Bernard of Italy. Lothair would also inherit their lands if they were to die childless. Lothair was then crowned joint emperor by his father at
Aachen. At the same time, Aquitaine and Bavaria were granted to his brothers Pippin and Louis, respectively, as subsidiary kingdoms.
Following the death of Bernard (818), brought on by his plotting against and blinding by Louis the Pious, Italy was awarded to Lothair. In 821, Lothair married
Ermengarde (d. 851), daughter of
Hugh the
Count of Tours. In 822, he assumed the government of
Italy
Italy, officially the Italian Republic, is a country in Southern Europe, Southern and Western Europe, Western Europe. It consists of Italian Peninsula, a peninsula that extends into the Mediterranean Sea, with the Alps on its northern land b ...
, and at Easter, 5 April 823, he received the royal crown of Italy, and was again crowned as emperor by
Pope Paschal I, this time at
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, ...
. In November 824, Lothair promulgated a statute, the ''
Constitutio Romana'', concerning the relations of pope and emperor, which reserved the supreme power to the secular potentate, and he afterwards issued various ordinances for the good government of Italy.
On Lothair's return to his father's court, his stepmother
Judith won his consent to her plan for securing a kingdom for her son
Charles, a scheme which was carried out in 829, when the young prince was given
Alemannia as king. Lothair, however, soon changed his attitude and spent the succeeding decade in constant strife over the division of the Empire with his father. He was alternately master of the Empire, and banished and confined to Italy, at one time taking up arms in alliance with his brothers and at another fighting against them, whilst the bounds of his appointed kingdom were in turn extended and reduced.
Division of the kingdom
The first rebellion began in 830. All three brothers fought their father, whom they deposed. In 831, their father was reinstated and he deprived Lothair of his imperial title and gave Italy to Charles. The second rebellion was instigated by
Angilbert II, Archbishop of Milan in 833, and again Louis was deposed in 834. Lothair, through the loyalty of the Lombards and later reconciliations, retained Italy and the imperial position through all remaining divisions of the Empire by his father.

When Louis the Pious was dying in 840, he sent the imperial insignia to Lothair, who, disregarding the various partitions, claimed the whole of the Empire. He was 45 years old when his father died. Negotiations with his brother Louis the German and his half-brother Charles, both of whom resisted this claim, were followed by an alliance of the younger brothers against Lothair.
A decisive battle was fought at
Fontenay-en-Puisaye on 25 June 841, when, in spite of his
and his allied nephew
Pepin II of Aquitaine's personal gallantry, Lothair was defeated and fled to Aachen. With fresh troops he began a war of plunder, but the forces of his brothers were too strong, and taking with him such treasure as he could collect, he abandoned his capital to them.
He met with the leaders of the ''
Stellinga'' in
Speyer and promised them his support in return for theirs, but Louis and then the native Saxon nobility put down the ''Stellinga'' in the next years.
Peace negotiations began, and in June 842 the brothers met on an island in the
Saône. They agreed to an arrangement which developed, after much difficulty and delay, into the
Treaty of Verdun, signed in August 843. By this, Lothair received the imperial title as well as northern Italy and a long stretch of territory from the
North Sea
The North Sea lies between Great Britain, Denmark, Norway, Germany, the Netherlands, Belgium, and France. A sea on the European continental shelf, it connects to the Atlantic Ocean through the English Channel in the south and the Norwegian Se ...
to the
Mediterranean, essentially along the valleys of the
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 ...
and the
Rhône; this territory includes the regions
Lorraine,
Alsace
Alsace (, ; ) is a cultural region and a territorial collectivity in the Grand Est administrative region of northeastern France, on the west bank of the upper Rhine, next to Germany and Switzerland. In January 2021, it had a population of 1,9 ...
,
Burgundy, and
Provence. He soon ceded Italy to his eldest son,
Louis, and remained in his new kingdom, engaging in alternate quarrels and reconciliations with his brothers and in futile efforts to defend his lands from the attacks of the Northmen (as
Vikings were known in Frankish writings) and the
Saracens
file:Erhard Reuwich Sarazenen 1486.png, upright 1.5, Late 15th-century History of Germany, German woodcut depicting Saracens
''Saracen'' ( ) was a term used both in Greek language, Greek and Latin writings between the 5th and 15th centuries to ...
(as those loyal to the various Fatimids, Umayyads and Abbasides are known in Frankish writings).
In 845 the count of Arles,
Fulcrad, led a rebellion in
Provence. The emperor put it down and the count joined him in an expedition against the Saracens in Italy in 846.
Death and aftermath
In 855 he became seriously ill, and despairing of recovery renounced the throne, divided his lands among his three sons, and on 23 September entered the monastery of
Prüm, where he died six days later. He was buried at Prüm, where his remains were found in 1860.
It was at
Prüm that Lothair was most commemorated.
The same year, Lothair's kingdom was divided between his three sons
in a deal called the
Treaty of Prüm: the eldest,
Louis II, received Italy and the title of emperor; the second,
Lothair II, received
Lotharingia; the youngest,
Charles, received
Provence.
Family
Lothair married
Ermengarde of Tours in 821, who died in 851.
*
Louis II (825–875) Crowned as King of Italy in 844 by
Pope Sergius II. Crowned Emperor in 850. Married
Engelberga
*Hiltrude (826–865) Married
Berengar of Spoleto.
*Bertha (c. 830–852) Married to an unknown man, but later Abbess of Avenay.
*Gisela (c. 830–856) abbess of San Salvatore at Brescia.
*
Lothair II (835–869) Succeeded his father. Married
Teutberga, daughter of
Boso the Elder, Count of Arles.
*Rotrude (c. 840) Married
Lambert II of Nantes.
*
Charles (845–863) Invested with Provence, Lyon and Transjuranian Burgundy
One illegitimate child is known.
*Carloman (? – d. 853)
See also
*
Middle Francia
*
History of Italy
*
History of Burgundy
*
History of Provence
References
Sources
*
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External links
*
Surviving letters of Lothar I in Latin with English translation by Richard Matthew Pollard.
{{DEFAULTSORT:Lothair 01
795 births
855 deaths
9th-century Holy Roman Emperors
9th-century kings of Italy
9th-century dukes of Bavaria
Frankish warriors
Dukes of Lorraine
Dukes of Maine
Eifel in the Middle Ages
Rebel princes
Sons of emperors
Frankish kings