Was Boleslaw the Brave the first Polish ruler to was baptized? No, because the first Polish ruler to be baptised was, of course, Mieszko I, who in 966 was also baptised personally and from a pagan ruler became a fully-fledged Christian ruler. Mieszko I's son, Boleslaw Chrobry, was not the first Polish ruler to be baptised, but only his successor.

Instead, he was the first crowned king of Poland who, like his father, embraced the Christian faith and continued this tradition in our lands. So to the question: :who was the first ruler of PolandWho was baptized?" should be answered firmly and certainly that it was Mieszko I.