Bolesław I the Brave
Bolesław I the Brave (Polish Bolesław I Chrobry) (967  June 17, 1025) was the duke of Poland from 992 to April 18, 1025 and King of Poland from April 18 to June 17, 1025. He was also a duke of Bohemia known as Boleslav IV from 1003 to 1004. He was the son of Mieszko I, first known ruler of Poland.