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The castle is known for being one of the places where Richard I of England was imprisoned after being captured near Vienna by Leopold V, Duke of Austria, in 1192.
Leopold V, Archduke of Austria (1586–1632), Regent of the Tyrol and Further Austria
title=Governor, later Archduke of Further Austria|
Leopold's share of the immense ransom, supposedly six thousand buckets—about 23 tons—of silver, became the foundation for the mint in Vienna, and was used to build new city walls for Vienna, as well as to found the towns of Wiener Neustadt and Friedberg in Styria.
In the Georgenberg Pact of 1186 he had agreed that his lands should pass to Leopold V, the Babenberg Duke of Austria.
In the 1350s the Hungarian monarch, Louis I, was able to assemble a force of 50,000 men by joining his forces with reinforcements sent by the Duke of Austria, the Counts of Gorizia, the Lord of Padua, Francesco I da Carrara, and the Patriarchate of Aquileia, a state within the Holy Roman Empire.
Helena of Hungary, Duchess of Austria (c. 1158–1199), daughter of King Géza II of Hungary and wife of Leopold V, Duke of Austria