Bolesław I the Brave

Born around 967 to Duke Mieszko I and a Bohemian princess, Bolesław ruled Lesser Poland while his father still lived. When Mieszko died in 992 and the realm fractured, Bolesław exiled his stepmother, purged his half-brothers, and reunified Poland by 995. He backed missionary bishops, and when Adalbert of Prague was martyred in 997, Bolesław ransomed the body for its weight in gold - a gesture that helped secure Polish church independence at the Congress of Gniezno in 1000, where Emperor Otto III allowed a metropolitan see free of German oversight. After Otto's death, Bolesław fought his successor Henry II for years, captured Kiev in 1018, and installed his son-in-law as ruler there. He conquered slices of Bohemia, Moravia, Slovakia, and Lusatia, built forts and churches, minted Poland's first coinage, and on 17 June 1025 died as the first man to hold the Polish title rex.