In 1385 Lithuania entered into a union with the Polish Kingdom creating shift in the balance of power. Both nations were more than aware that only by acting together could the expansionist plans of the Teutonic Order be thwarted.
The following year The Grand Duke of Lithuania, Vladyslav Jogaila, married the Queen of Poland and acceded to the Polish throne. He became a Christian, and changed his name to Wladyslaw Jagiello. Jagiello brought Christianity to the last pagan European country, Lithuania in 1387. It was obvious that war could not be avoided between the two enemies.
