Mieszko III the Old
Bolesław's eldest son died in 1172 aged sixteen and reportedly the high duke was devastated by his death. He was succeeded in the Masovian-Kujavian principality by his second and only surviving son Leszek, at the age of eleven or less. As overlord and holder of Kraków and Gniezno, he however was succeeded by his next brother Mieszko III the Old.