Poland became a unified kingdom in the first half of the 10th century, and officially adopted Catholicism in 966. The first major settlements were Poznań, Gniezno, Giecz, and Ostrów Lednicki. Gniezno was probably the most important city at that time, as the first king’s coronation, of Bolesław the Brave, took place there in 1025. A decade later in 1038, the capital was moved to Kraków …