One of the most prominent structures in the city is Bratislava Castle, situated on a plateau 85 metres above the Danube. The castle hill site has been inhabited since the transitional period between the Stone and Bronze ages and has been the acropolis of a Celtic town, part of the Roman Limes Romanus, a huge Slavic fortified settlement, and a political, military and religious centre for Great Moravia. A stone castle was not constructed until the 10th century, when the area was part of the Kingdom of Hungary. The castle was converted into a Gothic anti-Hussite fortress under Sigismund of Luxemburg in 1430, became a Renaissance castle in 1562 and was rebuilt in 1649 in the baroque style. Under Queen Maria Theresa, the castle became a prestigious royal seat. In 1811, the castle was inadvertently destroyed by fire and lay in ruins until the 1950s,when it was rebuilt mostly in its former Theresian style.