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Fort St. Angelo (Maltese: Forti Sant'Anġlu or Fortizza Sant'Anġlu) is a bastioned fort in Birgu, Malta, located at the centre of the Grand Harbour. It was originally built in the medieval period as a castle called the Castrum Maris (English: Castle by the Sea; Italian: Castello al Mare). It was rebuilt by the Order of Saint John as a bastioned fort called Fort Saint Angelo between the 1530s and the 1560s, and it is best known for its role as the Order's headquarters during the Great Siege of Malta of 1565. A major reconstruction to designs of Carlos de Grunenbergh took place in the 1690s, giving the fort its current appearance.