"The fortifications of Birgu are a series of defensive walls and other fortifications which surround the city of Birgu, Malta. The first fortification to be built was Fort Saint Angelo in the Middle Ages, and the majority of the fortifications were built between the 16th and 18th centuries by the Order of Saint John."@en . . . . . "13th century\u20131691 (Fort St. Angelo)" . . . "Fortifications of Birgu"@en . "1530s\u201318th century (rest of city walls)" . "Fortifikazzjonijiet tal-Birgu"@en . .