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Vladislaus II (Władysław II Jagiełło, Jogaila; ca.1348–1434) was a grand duke of Lithuania and king of Poland. He ruled in Lithuania from 1377, initially with his uncle, Kęstutis. In 1386, he converted to Christianity, was baptized as Vladislaus, married the eleven-year-old Queen Hedwig (Jadwiga) and was crowned Polish king as Vladislaus II. His reign in Poland lasted a further forty-eight years and laid the foundation for the centuries long Polish-Lithuanian union. He gave his name to the Jagiellon branch of the Gediminid dynasty which ruled both states until 1572, and became one of the most influential dynasties in medieval Europe. Jogaila was the last pagan ruler of medieval Lithuania. The allied victory over the Teutonic Knights in the Battle of Grunwald in 1410, followed by the First Peace of Thorn, secured the Polish and Lithuanian borders and marked the emergence of the Polish-Lithuanian alliance as a major European force. His reign is often considered the beginning of Poland's Golden Age. (Full article...)