The "Baptism of Poland" refers to the event in 966 AD when Mieszko I, the first ruler of the Polish state, converted to Christianity. This significant act marked the beginning of Poland's Christianization and its integration into the broader European community. Mieszko's baptism was also a strategic move to strengthen his political power and secure alliances with neighboring Christian states. The baptism was performed by Christian missionaries from the Holy Roman Empire, and it led to the establishment of the Roman Catholic Church in Poland. This event is often seen as a foundational moment in Polish history, shaping the nation's culture, identity, and religious landscape for centuries to come.