Battle of Varna
Władysław III (31 October 1424 – 10 November 1444), also known as Władysław of Varna, was King of Poland and the Supreme Duke ("Supremus Dux") of Grand Duchy of Lithuania from 1434 and King of Hungary and Croatia from 1440 until his death at the Battle of Varna. He was the eldest son of Władysław II Jagiełło, King of Poland and Grand Duke of Lithuania, and the Lithuanian noblewoman Sophia of Halshany.