Fortifications of Mdina
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The fortifications of Mdina ( mt, Is-Swar tal-Imdina) are a series of
defensive wall A defensive wall is a fortification usually used to protect a city, town or other settlement from potential aggressors. The walls can range from simple palisades or earthworks to extensive military fortifications with towers, bastions and gates ...
s which surround the former capital city of
Mdina Mdina ( mt, L-Imdina ; phn, 𐤌𐤋𐤈, Maleṭ; grc, Μελίττη, Melíttē; ar, مدينة, Madīnah; ), also known by its Italian-language titles ("Old City") and ("Notable City"), is a fortified city in the Northern Region of Ma ...
,
Malta Malta ( , , ), officially the Republic of Malta ( mt, Repubblika ta' Malta ), is an island country in the Mediterranean Sea. It consists of an archipelago, between Italy and Libya, and is often considered a part of Southern Europe. It lies ...
. The city was founded as Maleth by the
Phoenicia Phoenicia () was an ancient thalassocratic civilization originating in the Levant region of the eastern Mediterranean, primarily located in modern Lebanon. The territory of the Phoenician city-states extended and shrank throughout their his ...
ns in around the 8th century BC, and it later became part of the
Roman Empire The Roman Empire ( la, Imperium Romanum ; grc-gre, Βασιλεία τῶν Ῥωμαίων, Basileía tôn Rhōmaíōn) was the post-Roman Republic, Republican period of ancient Rome. As a polity, it included large territorial holdings aro ...
under the name Melite. The ancient city was surrounded by walls, but very few remains of these have survived. The city walls were rebuilt a number of times, including by the
Byzantine Empire The Byzantine Empire, also referred to as the Eastern Roman Empire or Byzantium, was the continuation of the Roman Empire primarily in its eastern provinces during Late Antiquity and the Middle Ages, when its capital city was Constantinopl ...
in around the 8th century AD, the Arabs in around the 11th century, and the
Kingdom of Sicily The Kingdom of Sicily ( la, Regnum Siciliae; it, Regno di Sicilia; scn, Regnu di Sicilia) was a state that existed in the south of the Italian Peninsula and for a time the region of Ifriqiya from its founding by Roger II of Sicily in 1130 un ...
in the medieval period until the 15th century. Most of the extant fortifications were built by the Order of Saint John between the 16th and 18th centuries. The city has withstood a number of sieges, and it was defeated twice – first by the
Aghlabids The Aghlabids ( ar, الأغالبة) were an Arab dynasty of emirs from the Najdi tribe of Banu Tamim, who ruled Ifriqiya and parts of Southern Italy, Sicily, and possibly Sardinia, nominally on behalf of the Abbasid Caliph, for about a ...
in 870 and then by Maltese rebels in 1798. Today, the city walls are still intact except for some
outwork An outwork is a minor fortification built or established outside the principal fortification limits, detached or semidetached. Outworks such as ravelins, lunettes (demilunes), flèches and caponiers to shield bastions and fortification curtain ...
s, and they are among the best preserved fortifications in Malta. Mdina has been on Malta's tentative list of
UNESCO The United Nations Educational, Scientific and Cultural Organization is a List of specialized agencies of the United Nations, specialized agency of the United Nations (UN) aimed at promoting world peace and security through international coope ...
World Heritage Site A World Heritage Site is a landmark or area with legal protection by an international convention administered by the United Nations Educational, Scientific and Cultural Organization (UNESCO). World Heritage Sites are designated by UNESCO for ...
s since 1998.


Punic-Roman walls

The city of Mdina occupies the tip of a plateau located on high ground in the northern part of the island of Malta, far away from the sea. The site has been inhabited since prehistory, and by the
Bronze Age The Bronze Age is a historic period, lasting approximately from 3300 BC to 1200 BC, characterized by the use of bronze, the presence of writing in some areas, and other early features of urban civilization. The Bronze Age is the second pri ...
it was a place of refuge since it was naturally defensible. The
Phoenicia Phoenicia () was an ancient thalassocratic civilization originating in the Levant region of the eastern Mediterranean, primarily located in modern Lebanon. The territory of the Phoenician city-states extended and shrank throughout their his ...
ns colonized Malta in around the 8th century BC, and they founded the city of Maleth on this plateau. It was taken over by the
Roman Republic The Roman Republic ( la, Res publica Romana ) was a form of government of Rome and the era of the classical Roman civilization when it was run through public representation of the Roman people. Beginning with the overthrow of the Roman Ki ...
in 218 BC, becoming known as Melite. The Punic-Roman city was about three times the size of present-day Mdina, extending into a large part of modern
Rabat Rabat (, also , ; ar, الرِّبَاط, er-Ribât; ber, ⵕⵕⴱⴰⵟ, ṛṛbaṭ) is the capital city of Morocco and the country's seventh largest city with an urban population of approximately 580,000 (2014) and a metropolitan populatio ...
. Melite's walls had a thickness of around and were surrounded by a -long
ditch A ditch is a small to moderate divot created to channel water. A ditch can be used for drainage, to drain water from low-lying areas, alongside roadways or fields, or to channel water from a more distant source for plant irrigation. Ditches ar ...
. Very little remains of the Punic-Roman walls of Melite still survive. The remains of a city gate or tower were discovered in Saqqajja in modern Rabat, about below the current street level. Parts of the ditch have survived under present-day St. Rita Street and the Church of St. Paul. The lower foundations of some Punic-Roman ramparts, consisting of rusticated
ashlar Ashlar () is finely dressed (cut, worked) stone, either an individual stone that has been worked until squared, or a structure built from such stones. Ashlar is the finest stone masonry unit, generally rectangular cuboid, mentioned by Vitruv ...
blocks three
courses Course may refer to: Directions or navigation * Course (navigation), the path of travel * Course (orienteering), a series of control points visited by orienteers during a competition, marked with red/white flags in the terrain, and corresponding ...
high still ''in situ'', were found near the Magazine Curtain in the western part of Mdina. The only other remains of the ancient walls are Punic-Roman masonry blocks which were reused in the medieval period. These include a wall around Greeks Gate, and some stones which were discovered in excavations at Inguanez Street and the Xara Palace.


Medieval walls

At some point following the
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 va ...
, a retrenchment was built within the city, reducing it to its present size. This was done to make the city's perimeter more easily defensible, and similar reductions in city sizes were common around the Mediterranean region in the early Middle Ages. Although it was traditionally assumed that the retrenchment was built by the Arabs, it has been suggested that it was actually built by the
Byzantine Empire The Byzantine Empire, also referred to as the Eastern Roman Empire or Byzantium, was the continuation of the Roman Empire primarily in its eastern provinces during Late Antiquity and the Middle Ages, when its capital city was Constantinopl ...
in around the 8th century, when the threat from the Arabs increased. In 870, Melite was captured by the
Aghlabid The Aghlabids ( ar, الأغالبة) were an Arab dynasty of emirs from the Najdi tribe of Banu Tamim, who ruled Ifriqiya and parts of Southern Italy, Sicily, and possibly Sardinia, nominally on behalf of the Abbasid Caliph, for about a ...
s, who massacred its inhabitants and "demolished its fortress" according to the chronicler Al-Himyarī. This account further mentions that Malta remained almost uninhabited until it was resettled in around 1048 or 1049 by a Muslim community and their slaves, who built a settlement called Medina on the site of Melite. Archaeological evidence suggests that the city was already a thriving Muslim settlement by the beginning of the 11th century, so 1048–49 might be the date when the city was officially founded and its walls were constructed. The Byzantines besieged Medina in 1053–54, but were repelled by its defenders. Medina surrendered peacefully to
Roger I of Sicily Roger I ( it, Ruggero I, Arabic: ''رُجار'', ''Rujār''; Maltese: ''Ruġġieru'', – 22 June 1101), nicknamed Roger Bosso and The Great, was a Norman nobleman who became the first Count of Sicily from 1071 to 1101. He was a member of the ...
after a short siege in 1091, and Malta was subsequently incorporated into the
County A county is a geographic region of a country used for administrative or other purposes Chambers Dictionary, L. Brookes (ed.), 2005, Chambers Harrap Publishers Ltd, Edinburgh in certain modern nations. The term is derived from the Old French ...
and later the
Kingdom of Sicily The Kingdom of Sicily ( la, Regnum Siciliae; it, Regno di Sicilia; scn, Regnu di Sicilia) was a state that existed in the south of the Italian Peninsula and for a time the region of Ifriqiya from its founding by Roger II of Sicily in 1130 un ...
, being dominated by a succession of feudal lords. The fortifications of Mdina were rebuilt and modified a number of times over the following centuries. A castle known as the ''Castellu di la Chitati'' or the ''castrum civitas'' was built on the southeast corner of the city near the main entrance, probably on the site of an earlier Byzantine fort. The city withstood a
siege A siege is a military blockade of a city, or fortress, with the intent of conquering by attrition, or a well-prepared assault. This derives from la, sedere, lit=to sit. Siege warfare is a form of constant, low-intensity conflict characteriz ...
by Hafsid invaders in 1429. By the 15th century, most of Mdina's enciente had a system of double walls. The land front was flanked by four towers, one near Greeks Gate, another at the centre of the land front, the ''Turri Mastra'' (also known as ''Turri di la bandiera'') near the main entrance and the ''Turri di la Camera'' at the southeast corner of the city. A
barbican A barbican (from fro, barbacane) is a fortified outpost or fortified gateway, such as at an outer defense perimeter of a city or castle, or any tower situated over a gate or bridge which was used for defensive purposes. Europe In the Middle A ...
was built near Mdina's main entrance sometime after 1448. In the 1450s there were fears of a Barbary or Ottoman attack, so efforts were made to improve Mdina's walls. The main ditch was completed, and the ''Castellu di la Chitati'' was partially demolished by royal licence in 1453, due to its ruinous state and the excessive cost for its upkeep. By 1474, cannons had been introduced in Mdina. Other extensive preparations for an attack were made in the 1480s, when the fortifications were once again improved under the direction of Sicilian military engineers. At this point, some buildings in Rabat were demolished to clear the fortifications' line of fire. By 1522, the fortifications were being modernized with the construction of
embrasure An embrasure (or crenel or crenelle; sometimes called gunhole in the domain of gunpowder-era architecture) is the opening in a battlement between two raised solid portions (merlons). Alternatively, an embrasure can be a space hollowed out ...
s. However, the walls were still regarded as obsolete, since they lacked
bastion A bastion or bulwark is a structure projecting outward from the curtain wall of a fortification, most commonly angular in shape and positioned at the corners of the fort. The fully developed bastion consists of two faces and two flanks, with fi ...
s and could not resist bombardment from modern artillery. Most of the medieval walls of Mdina were gradually dismantled between the 1530s and 1720s, when the city's fortifications were being upgraded by the Hospitallers. One of the most significant visible remnants of the medieval fortifications is the Greeks Gate and the surrounding curtain walls, which still retains its medieval form apart from the outer portal which was built in the 18th century. Parts of the double walls, including the remains of two gun loops, still stand between the gate and the Torre dello Standardo. Most of the northern and eastern walls date back to the medieval period, although some sections were rebuilt by the Hospitallers. The northern ramparts contain a medieval wall tower, while the remains of Byzantine antemurals and the foundations of a late 15th-century artillery platform have been found in the eastern walls.


Hospitaller walls

When the Order of Saint John took over in Malta in 1530, the nobles ceremoniously handed over the keys of the city to Grand Master Philippe Villiers de L'Isle-Adam. The Order settled in
Birgu Birgu ( mt, Il-Birgu , it, Vittoriosa), also known by its title Città Vittoriosa ("''Victorious City''"), is an old fortified city on the south side of the Grand Harbour in the South Eastern Region of Malta. The city occupies a promontory of ...
and Mdina lost its status as capital city, but L'Isle-Adam built a palace on the remaining part of the ''Castellu di la Chitati'', which became the meeting place of the civil administrative council known as the Università. The first major upgrade of Mdina's fortifications occurred in the 1540s, during the magistracy of
Juan de Homedes y Coscon Fra' Juan de Homedes y Coscón (c. 1477 – 6 September 1553) was a Spanish knight of Aragon who served as the 47th Grand Master of the Order of Malta, between 1536 and 1553. Early life Little is known about de Homedes' early life, except ...
. Two new bastions were built at the extremities of the land front, possibly to designs of the military engineer
Antonio Ferramolino Antonio Ferramolino was a 16th-century Italian architect and military engineer. He is also known as Sferrandino da Bergamo, and is called Hernan Molin in Spanish sources. He is mostly known for his work in Sicily, but he also designed fortificatio ...
. Parts of the eastern walls were also rebuilt ''en crémaillère'', the only instance this style is found in Malta. The 15th-century barbican in front of the main gate was demolished in 1551 since it obstructed the line of fire of the newly built bastions. That year, the city withstood a brief Ottoman attack. Mdina was not attacked directly during the
Great Siege of Malta The Great Siege of Malta ( Maltese: ''L-Assedju l-Kbir'') occurred in 1565 when the Ottoman Empire attempted to conquer the island of Malta, then held by the Knights Hospitaller. The siege lasted nearly four months, from 18 May to 13 September ...
of 1565, but it nonetheless played a crucial role in the siege. Ottoman general Mustafa Pasha wanted to take over the poorly defended city first, but was overruled by Piali Pasha who wanted to attack
Fort Saint Elmo Fort Saint Elmo ( mt, Forti Sant'Iermu) is a star fort in Valletta, Malta. It stands on the seaward shore of the Sciberras Peninsula that divides Marsamxett Harbour from Grand Harbour, and commands the entrances to both harbours along with Fort ...
. The fort was taken over after a month of heavy fighting, but the Ottomans had lost crucial time in doing so. On 7 August, the Order's cavalry in Mdina attacked the unprotected Ottoman field hospital, which led in the invaders abandoning a major assault on the main fortifications in Birgu and
Senglea Senglea ( mt, L-Isla ), also known by its title Città Invicta (or Civitas Invicta), is a fortified city in the South Eastern Region of Malta. It is one of the Three Cities in the Grand Harbour area, the other two being Cospicua and Vittorios ...
. The Ottomans tried to take over the city in September so as to winter there, but abandoned their plans when Mdina fired its cannon, leading them to believe that the city had ammunition to spare. After the siege, Maltese military engineer Girolamo Cassar drew up plans to reduce Mdina's size by half and turning it into a fortress, but these were never implemented due to protests by the city's nobles. The city's main gate was reconstructed in the early 17th century, but the next major alterations were not made until the 1650s, when the large De Redin Bastion was built at the centre of the land front. Despite these modifications, by 1658 there were also proposals to abandon or demolish the entire fortress due to its state of disrepair, although these plans were opposed by the locals. In the late 17th century, some of Mdina's medieval double walls began to be encased in sloping ramparts. A major restoration of Mdina's fortifications was undertaken in the 1720s by the French military engineer
Charles François de Mondion Charles François de Mondion (6 October 1681 – 25 December 1733) was a French architect and military engineer who was active in Hospitaller Malta in the early 18th century. He was also a member of the Order of Saint John. Career Mondion was bo ...
, during the magistracy of
António Manoel de Vilhena António Manoel de Vilhena (28 May 1663 – 10 December 1736) was a Portuguese nobleman who was the 66th Prince and Grand Master of the Order of St. John of Jerusalem from 19 June 1722 to his death in 1736. Unlike a number of the other Grand ...
. L'Isle-Adam's palace, including the remaining parts of the ''Castellu di la Chitati'', were demolished to make way for Palazzo Vilhena, while the main gate was walled up and a new
city gate A city gate is a gate which is, or was, set within a city wall. It is a type of fortified gateway. Uses City gates were traditionally built to provide a point of controlled access to and departure from a walled city for people, vehicles, go ...
was built in the
Baroque The Baroque (, ; ) is a style of architecture, music, dance, painting, sculpture, poetry, and other arts that flourished in Europe from the early 17th century until the 1750s. In the territories of the Spanish and Portuguese empires including ...
style. A Baroque portal was also added to the Greeks Gate. The remaining medieval towers in the land front were demolished and the Torre dello Standardo was built on the site of the ''Turri Mastra'', while the entire western walls of the city were demolished to make way for a single
casemate A casemate is a fortified gun emplacement or armored structure from which guns are fired, in a fortification, warship, or armoured fighting vehicle.Webster's New Collegiate Dictionary When referring to antiquity, the term "casemate wall" me ...
d curtain wall known as Magazine Curtain. D'Homedes Bastion was modified with the addition of a bastionette, while traverse-like batteries were built at the extremities of the land front. The city was further protected with the construction of
outwork An outwork is a minor fortification built or established outside the principal fortification limits, detached or semidetached. Outworks such as ravelins, lunettes (demilunes), flèches and caponiers to shield bastions and fortification curtain ...
s, including a
covertway In military architecture, a covertway or covered way (french: chemin couvert it, strada coperta) is a path on top of the counterscarp of a fortification. It is protected by an embankment which is made up by the crest of the glacis. It is able to ...
, two places-of-arms and a
glacis A glacis (; ) in military engineering is an artificial slope as part of a medieval castle or in early modern fortresses. They may be constructed of earth as a temporary structure or of stone in more permanent structure. More generally, a glacis ...
. Mondion also made further plans to strengthen Mdina's fortifications, but they were not implemented since the Order focused on building its fortifications in the harbour area. The only major addition to the Mdina fortifications after Mondion's reconstruction was Despuig Bastion, which was built during the reign of Ramon Despuig between 1739 and 1746. On 10 June 1798, Mdina was captured by French forces without much resistance during the French invasion of Malta. A French garrison remained in the city, but a Maltese uprising broke out on 2 September of that year. The following day, rebels entered the city through a sally port in Despuig Bastion and massacred the garrison of 65 men. These events marked the beginning of a two-year uprising and blockade, which ended in 1800 with Malta becoming a British protectorate. Mdina's fortifications remained in use during the British period, and some minor alterations such as the installation of gun emplacements were made in the 19th century. By the end of the century, the city was regarded as forming part of the defensive system of the
Victoria Lines The Victoria Lines, originally known as the North West Front, are a line of fortifications that spans 12 kilometres along the width of Malta, dividing the north of the island from the more heavily populated south. Location The Victoria Lines ru ...
. In the 1890s, the battery near St. Peter Bastion was demolished and a gateway was opened within the Magazine Curtain. This was done in order to facilitate access to the newly built
railway station Rail transport (also known as train transport) is a means of transport that transfers passengers and goods on wheeled vehicles running on rails, which are incorporated in Track (rail transport), tracks. In contrast to road transport, where the ...
located nearby. The fortifications were included on the Antiquities List of 1925. Some of the
countermine Tunnel warfare involves war being conducted in tunnel and other underground cavities. It often includes the construction of underground facilities (mining or undermining) in order to attack or defend, and the use of existing natural caves and ...
galleries in Mdina's ditch were used as air raid shelters during
World War II World War II or the Second World War, often abbreviated as WWII or WW2, was a world war that lasted from 1939 to 1945. It involved the World War II by country, vast majority of the world's countries—including all of the great power ...
.


Recent history

Sections of the medieval walls of Mdina were rediscovered by Dr. Stephen C. Spiteri and Mario Farrugia while they were surveying the bastions in 2002. The first plans to undertake a major restoration of Mdina's walls were made in 2006, as part of a project that also included restoration of the fortifications of
Valletta Valletta (, mt, il-Belt Valletta, ) is an administrative unit and capital of Malta. Located on the main island, between Marsamxett Harbour to the west and the Grand Harbour to the east, its population within administrative limits in 2014 ...
,
Birgu Birgu ( mt, Il-Birgu , it, Vittoriosa), also known by its title Città Vittoriosa ("''Victorious City''"), is an old fortified city on the south side of the Grand Harbour in the South Eastern Region of Malta. The city occupies a promontory of ...
and the
Cittadella Cittadella ( vec, Sitadeła) is a medieval walled city in the province of Padua, northern Italy, founded in the 13th century as a military outpost of Padua. The surrounding wall has been restored and is in circumference with a diameter of around ...
. In the case of Mdina, the main focus was to consolidate the terrain, since the city is built on a blue clay plateau which is prone to subsidence. The multimillion-euro restoration was partially financed by the European Regional Development Fund. Works began in early 2008 by the Restoration Unit. The process of restoration was documented by Dr. Spiteri. In 2011, steel rods were inserted into D'Homedes Bastion in order to prevent the walls from slipping down the clay slopes. The ditch was inaugurated as a public garden in March 2013. All ERDF-financed work was completed in late 2013, but the Restoration Directorate later restored other parts of the fortifications, including the northern walls, St. Peter Bastion and the area around Greeks Gate. The project was fully completed in early 2016. Throughout the course of the restoration, a number of archaeological discoveries were made. Excavations along the eastern part of the city walls unearthed Byzantine antemurals and the base of a late 15th-century ''cubete artillero'' (artillery platform). In 2010, remains of foundations of the Punic-Roman walls were found when excavations were made along the Magazine Curtain. A late 14th-century stone block bearing the coat of arms of Guglielmo Murina, possibly originating from the ''Castellu di la Chitati'', was discovered in 2012 during the restoration of D'Homedes Bastion. This block is now displayed at the Fortifications Interpretation Centre in
Valletta Valletta (, mt, il-Belt Valletta, ) is an administrative unit and capital of Malta. Located on the main island, between Marsamxett Harbour to the west and the Grand Harbour to the east, its population within administrative limits in 2014 ...
.


Layout

The present configuration of Mdina's fortifications consists of an irregular perimeter of curtain walls stiffened by a number of bastions. The northern, western and eastern walls are built on the perimeter of the natural plateau, so they were difficult to attack. The southern perimeter of the city is built on level ground, along what is now the border with Rabat. It was the only realistic direction to assault the city, and was hence known as the Mdina Land Front. The southern perimeter contains an arrowhead-shaped bastion with rectangular orillons on each extremity, with a large pentagonal bastion in the centre: *St. Peter Bastion, also known as Greeks Gate Bastion – built in the 1550s during the magistracy of
Juan de Homedes y Coscon Fra' Juan de Homedes y Coscón (c. 1477 – 6 September 1553) was a Spanish knight of Aragon who served as the 47th Grand Master of the Order of Malta, between 1536 and 1553. Early life Little is known about de Homedes' early life, except ...
*De Redin Bastion – built in the 1650s during the magistracy of
Martin de Redin Fra' Martin de Redin (Pamplona, 1579 – Malta, 6 February 1660) was a Spanish military and political figure, and the 58th Prince and Grand Master of the Order of Malta. He became Grand Prior of the Order of Malta of Navarra in 1641, and Vic ...
*D'Homedes Bastion, also known as St. Paul Bastion or the ''belguardo del Palacio'' – built between the 1540s and 1551 during the magistracy of Juan de Homedes y Coscon It is further defended by a bastionette. The two gates into the city, Mdina Gate and Greeks Gate, are located within the curtain walls of the land front. Remains of the medieval double walls as well as the 18th-century Torre dello Standardo are located just within the city walls. The land front is surrounded by a deep ditch, and a traverse-like battery is located in its eastern extremity. Most of the eastern walls of the city consist of an ''en crémaillère'' enciente built in the mid-16th century, although parts of the walls date back to the medieval period. The pentagonal Despuig Bastion, built in the 1740s during the magistracy Ramon Despuig, is grafted below the walls on the northeastern corner of the city. The northern walls of Mdina still retain their medieval form with a few Hospitaller modifications, and they contain the only surviving tower in the city walls. St. Mary's Bastion or Ta' Bachar Bastion, which was built in the 16th century, is grafted on the northwest corner of the city. This is linked to St. Peter Bastion by the Magazine Curtain, a long
casemate A casemate is a fortified gun emplacement or armored structure from which guns are fired, in a fortification, warship, or armoured fighting vehicle.Webster's New Collegiate Dictionary When referring to antiquity, the term "casemate wall" me ...
d curtain wall built in the 1720s in the western part of the city. A small gate built by the British in the 19th century is located within this curtain wall.


Notes


References


Bibliography

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External links


National Inventory of the Cultural Property of the Maltese Islands
{{Mdina Mdina
Mdina Mdina ( mt, L-Imdina ; phn, 𐤌𐤋𐤈, Maleṭ; grc, Μελίττη, Melíttē; ar, مدينة, Madīnah; ), also known by its Italian-language titles ("Old City") and ("Notable City"), is a fortified city in the Northern Region of Ma ...
Mdina Mdina ( mt, L-Imdina ; phn, 𐤌𐤋𐤈, Maleṭ; grc, Μελίττη, Melíttē; ar, مدينة, Madīnah; ), also known by its Italian-language titles ("Old City") and ("Notable City"), is a fortified city in the Northern Region of Ma ...
Limestone buildings in Malta National Inventory of the Cultural Property of the Maltese Islands 15th-century fortifications 16th-century fortifications 17th-century fortifications 18th-century fortifications