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The baptism of Władysław II Jagiełło took place in Kraków, Poland, in 1386. This significant event marked Jagiełło's conversion to Roman Catholicism and paved the way for his marriage to Jadwiga, Queen of Poland. The union of Poland and Lithuania under the rule of Jagiełło and Jadwiga, known as the Polish-Lithuanian Commonwealth, resulted in the creation of one of the largest and most powerful states in Europe at the time.