William ( – 15 July 1406), known as William the Courteous (), 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. Biography Born in Vienna, William was the oldest son of Duke Leopold III of Austria (1351–1386) and his consort Viridis Visconti (1352–1414), a daughter of Lord Bernabò of Milan. Leopold III had already acted as regent over the Tyrol and the Further Austrian possessions in Swabia; in 1379 he signed the Treaty of Neuberg with his elder brother Duke Albert III, whereupon he also received the Inner Austrian lands. At the age of 8, William was betrothed to the Anjou princess Hedwig (Jadwiga; 1373–1399), the youngest daughter of King Louis I of Hungary, who had also become King of Poland in 1370. This was one of the first attempts of the Habsburgs to extend their dominions by marrying heiresses, as Louis intended his elder daughter Mary and her fiancé Sigismund of Luxembourg to succeed in Poland, while Jadwiga was designated heir to the Kingdom of Hungary. When King Louis died in 1382, Mary succeeded in Hungary. However, the Polish nobles rejected Mary and Sigismund, and instead chose Jadwiga as queen regnant. They also repudiated her betrothal to William and enforced the break-up of the engagement. The Polish lords did not want to accept Jadwiga's fourteen-year-old fiancé, William of Habsburg, as their sovereign. They thought that the inexperienced William and his Austrian kinsmen could not safeguard Poland's interests against its powerful neighbours, especially the Luxemburgs which controlled Bohemia and Brandenburg, and had a strong claim on Hungary. According to Halecki, the lords of Lesser Poland were the first to suggest that Jadwiga should marry the pagan duke Jogaila of Lithuania. Jogaila sent his envoysincluding his brother, Skirgaila, and a German burgher from Riga, Hanul to Kraków to request Jadwiga's hand in January 1385. Jadwiga refused to answer, stating only that her mother would decide. Jogaila's two envoys left for Hungary and met Queen Elizabeth. She informed them that "she would allow whatever was advantageous to Poland and insisted that her daughter and the prelates and nobles of the Kingdom had to do what they considered would benefit Christianity and their kingdom",