Bolesław IV the Curly
According to the historian Miron Korduba, Leszek was the son of Maria. Józef Mitkowski and Kazimierz Jasiński supposed that he was the son of the first wife of Bolesław IV rather than the second. However, after the discovery of coins on which Leszek noted his parents as BOL (Bolesław IV the Curly) and ANA (Anastazja), it became clear that he was the son of his father's first marriage, as Wierzchosława is mentioned in some sources as Anastazja.