Auberge de Castille was built in 1573–74 to designs of the architect Girolamo Cassar. The original auberge, which took over the role of an earlier Auberge de Castille et Portugal in the former capital Birgu, was built in the Mannerist style, and it was regarded as Cassar's most innovative design. The auberge had a single storey, and its façade had panelled pilasters dividing it into 11 bays. The design of the auberge is known from a late 17th-century painting and an early 18th-century drawing. The original Auberge de Castille was dismantled and completely rebuilt in the Spanish Baroque style between 1741 and 1744, during the magistracy of Grand Master Manuel Pinto da Fonseca. The new building was built to designs of Andrea Belli, and construction was supervised by capomastro Domenico Cachia. Some alterations, including the enlargement of the main door, were made in 1791.
French occupation and British rule
The Order of St. John was expelled from Malta with the French invasion and occupation in 1798. The auberge subsequently became a headquarters for the French forces, and it later housed a Commission for National Property. The building suffered some damage during the blockade of 1798–1800. After Malta became a British protectorate, in 1805 the auberge became the headquarters of the British armed forces in Malta. It was also used as a residence for British officers. In 1814, a disabled contingent from the army of Egypt was accommodated in the auberge. A Protestant chapel was opened in one of the rooms of the first floor in 1840. A signalling station with a large aerial was installed on the roof in 1889 to communicate with warships of the Mediterranean Fleet moored in the Grand Harbour. It was known as the Castille Tower. The then princess, now Queen Elizabeth II, has worked with the Soldiers, Sailors, Airmen Families Association when it was housed at Auberge de Castile. In 1942, during World War II, the right side of the building was damaged by aerial bombardment. The damaged parts were later repaired, and the aerial was removed. The auberge was also used as the General Headquarters of the Army for Malta and Libya, and also for Cyprus after 1954.
Auberge de Castille is built in the Baroque style, and it is a two-storey building with a rectangular plan and a central courtyard. Its façade is divided into eleven bays defined by pilasters in the central bays or plain panelling in the outer bays. Ornate windows are set within recessed panels. The building has a continuous cornice, and its corners are rusticated. The main entrance is approached by a flight of steps, and the doorway is flanked by columns which support a trophy of arms and a bronze bust of Grand Master Manuel Pinto da Fonseca. A moulded window is located above the bust, and it is surmounted by Pinto's coat of arms. The centrepiece above the window bears the coats of arms of Castile and León and of Portugal. Just in front of the entrance are two historic canons, now used for decoration. The auberge has been called "probably the finest building in Malta". Both the exterior and the interior, especially the ornate façade and the steps leading to the doorway, were designed to be imposing. Auberge de Castille is linked to Auberge d'Italie across Merchants Street through a World War II-era underground air-raid shelter.
