In January 1429, at the Congress of Lutsk it was proposed by Sigismund, king of Hungary, that Vytautas should be crowned King of Lithuania. It resulted in a great crisis between Vytautas, king Władysław and Polish nobles. The envoys who were transporting documents supporting Vytautas's coronation and proposing an alliance between Lithuania, Hungary and the Teutonic Order were stopped at the Polish-Lithuanian border in the autumn of 1430. Vytautas died in the Trakai Island Castle, ending the whole affair. He was buried in the Cathedral of Vilnius. The knowledge about his remains has been lost.