Question: Who is Bolesław Of Cieszyn (Died 1356)'s paternal grandfather?
Sentence (from "Casimir I, Duke of Cieszyn"): Casimir I of Cieszyn (1280/90 –), was Duke of Cieszyn from 1315, Duke of Siewierz from 1337 and Duke of Bytom from 1357.
Relevant evidence: No