sent Daud, a pretender to the Ottoman throne, in early 1436. However, following the defeat of the rebels in 1436, plans for an anti-Ottoman alliance ended. Sigismund died on 9 December 1437 at Znojmo (), Moravia (now Czech Republic), and as ordered in life, he was buried at Nagyvárad, Hungary (today Oradea, Romania), next to the tomb of the king Saint Ladislaus I of Hungary, who was the ideal of the perfect monarch, warrior and Christian for that time and was deeply venerated by Sigismund. By his second wife, Barbara of Celje, he left an only daughter, Elisabeth of Luxembourg, who was married to Albert V, duke of Austria (later German king as Albert II) whom Sigismund named as his successor. As he left no sons, his line of the House of Luxembourg became extinct on his death. Family and issue Sigismund married twice but had little luck in securing the succession to his crowns. Each of his two marriages resulted in the birth of one child. His first-born child, probably a son, was born prematurely as a result of a horse riding accident suffered by Queen Mary of Hungary when she was well advanced in pregnancy. Mother and child both died shortly after the birth in the hills of Buda on 17 May 1395. This caused a deep succession crisis because Sigismund ruled over Hungary by right of his wife, and although he managed to keep his power, the crisis lasted until his second marriage to Barbara of Celje. Barbara's only child, born in the purple on 7 October 1409, probably in the castle of Visegrád, was Elisabeth of Luxembourg, the future queen consort of Hungary, Germany, and Bohemia. Queen Barbara was unable to give birth to any further issue. Elisabeth of Bohemia was thus the only surviving legitimate offspring of Sigismund. Hungarian affiliations Sigismund was known to speak fluent Hungarian, wore Hungarian-style royal clothes, and even grew his beard in the Hungarian fashion. He also spent huge amounts of money during his reign to rebuild the Gothic castles of Buda and Visegrád in the Kingdom of Hungary, ordering the transportation of materials from Austria and Bohemia. His many affairs with women led to the birth of several legends, as the one that existed decades later during the reign of the King Matthias Corvinus of Hungary. According to this, John Hunyadi was Sigismund's illegitimate son. Sigismund gave a ring