William the Courteous (c. 1370 – 15 July 1406) was a scion of the House of Habsburg, and Duke of Carinthia, Styria, and Carniola.Born in Vienna, he was the oldest son of Duke Leopold the Just and his wife, Viridis Visconti.At the age of 14, he was betrothed to Jadwiga, youngest daughter of King Louis I of Hungary, who was also king of Poland.
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