Wladyslaw Jagiello (1351?-1434) was a duke of Lithuania. He was born in Vilnius, Lithuania. The establishment of Catholic Christianity as the official religion of Lithuania, the Polish-Lithuanian Union, Battle of Grunwald in 1410 are the most important events during his reigns. The Jagiellonian era is usually characterized as the start of Poland's "golden age” when the country became a major European power and extended its frontiers to the north and east.

Wladyslaw Jagiello was a very intelligent person. He was very involved in Poland’s problems. He was good at solving international and country’s problems. He gave the nobility many privileges thanks to which they felt secure. He helped Polish culture and art develop. He renovated the Cracow Academy and treated it to many frescos. He started the Jagiellonian era, one of the strongest eras of Poland.
Jan Dlugosz wrote: Cordis simpliciti erat, sed magnifici – He was a simple but an amazing man. This one sentence describes our patron best.