The former owners, who were presumably also the builders, were the counts of
Werdenberg-Sargans. The
bergfried (the
keep, built in the 12th century) and parts of the eastern side are the oldest. The tower stands on a piece of ground that is in area. At the ground floor, the tower walls have a thickness of up to . The original entrance lay at the courtyard side at a height of . The chapel of St. Anna was presumably built in the
Middle Ages as well. The main altar is late-gothic. In the
Swabian War of 1499, the castle was burned by the
Swiss Confederacy. The western side was expanded by Count (1613–1640). The
princely family of Liechtenstein acquired Vaduz Castle in 1712, when it purchased the
countship of Vaduz. At this time,
Charles VI, Holy Roman Emperor, combined the countship with the
Lordship of Schellenberg, purchased by the Liechtensteins in 1699, to form the present Principality of Liechtenstein. ==Today==