King of Poland. That his name was King Ladislaus (Wladyslaw) II was an invention of a Lithuanian nobleman who married into power. The rule of his predecessor, King Louis, was brief, it had tremendous consequences for the subsequent character of the Polish state. During his reign, Louis amassed one of the largest dynastic regimes of his time. After his death, he left only two young daughters as heirs, and a war of succession erupted. The younger daughter, Jadwiga, was finally proclaimed Queen of Poland in 1385, at the age of 11 years. Enter Jagiello, also known as Jogaila, of Lithuania. A marriage with Jagiello was proposed to cement an alliance with Poland's powerful eastern neighbor. At the Union of Krewo in 1385, Jagiello agreed that in exchange for Jadwiga's hand he would convert to Christianity, coordinate operations against the Teutonic Knights, and associate Lithuania (which included most of present day Belarus and Ukraine) with Poland in a permanent union. Sadly it was a loveless marriage for Jadwiga. Jagiello was crowned as King of Poland in February of 1386 at an assembly of Polish barons and nobility; he adopted the name of Wladyslaw II.