William, Duke of Austria
William (c. 1370 – 15 July 1406), known as William the Courteous (German: Wilhelm der Freundliche), a member of the House of Habsburg, was Duke of Austria from 1386. As head of the Leopoldian line, he ruled over the Inner Austrian duchies of Carinthia, Styria and Carniola as well as the County of Tyrol and Further Austria from 1396 until his death.