The Castle of San Giusto stands on the hill overlooking the city of Trieste. It was the Austrian Imperial court who ordered the construction of a fortress to protect the town and provide accommodation for its Captain. The building work lasted from 1468 to 1636. It began with the Captain's House which was subsequently incorporated into a triangular fortress with a bastion at each corner. Each bastion was built to a different design, dictated by the defensive techniques in use at the time of construction: the Round or Venetian Bastion, built in 1508-1509; the polygonal Lalio or Hoyos Bastion, built in 1553-1557; the triangular Fiorito or Pomis Bastion, completed 1636. The Austrian Imperial Captains resided in the castle until 1750, when it was converted for use as a garrison and a prison. It was renovated and converted into a museum in 1936, since when it has stood as a symbol of the city, firstly because the sentry walkways on the parapets provide a splendid panorama, and secondly because it houses two important sections of the Civic Museums of History and Art: the Civic Museum of the Castle of San Giusto-Armoury and the Lapidarium of Tergeste in the Lalio Bastion.