Casimir I was a Polish prince who ruled from 1034 to 1058. He was the son of Mieszko II and played a significant role in the early history of Poland. His reign is noted for efforts to stabilize the kingdom after a period of turmoil and fragmentation. During his rule, Casimir I worked to restore the authority of the Polish monarchy and strengthen the ties between the nobility and the crown. He is often credited with laying the groundwork for the future unification of Poland, which would later be achieved by his descendants, including Bolesław II.