Władysław III of Poland, also known as Ladislaus of Varna, was King of Poland and Supreme Duke of the Grand Duchy of Lithuania from 1434, as well as King of Hungary and Croatia as Vladislaus I from 1440 until his presumed death at the Battle of Varna. He was the eldest son of Władysław II Jagiełło (Jogaila) and the Lithuanian noblewoman Sophia of Halshany.