The Kingdom of Poland was founded by the coronation of King Bolesław I the Brave in 1025. Bolesław was a member of the Piast dynasty, and was the son of Mieszko I, who was the first Duke of Poland to convert to Christianity. Bolesław was the fifth Piast ruler of Poland, and his dynasty ruled the Kingdom until Casimir the Great died without a son. The Kingdom passed to Casimir's nephew, the Angevin King of Hungary Louis I. Louis' daughter, Jadwiga, became the Queen of Poland at a young age, and then was to be married to Jogaila, Grand Duke of Lithuania, under the terms of the Union of Krewo.