William, Duke of Austria

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William the Courteous
Duke of Austria
Historic portrait by Anton Boys (about 1580)
Duke	1386–1406
Predecessor	Leopold III
Successor	Leopold IV
Born	c. 1370 Vienna, Austria
Died	(1406-07-15)15 July 1406 (age 36) Vienna
Burial	Ducal Crypt in St. Stephen's Cathedral, Vienna
Spouse	Jadwiga, Queen of Poland (disputed) (m. 1385, div. 1385) Joanna of Durazzo (m. 1401)
House	House of Habsburg
Father	Leopold III, Duke of Austria
Mother	Viridis Visconti

William (c. 1370 – 15 July 1406),^[1] known as William the Courteous (German: Wilhelm der Freundliche), a member of the House of Habsburg and Wilhelm, 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.