Question: When is Bolesław Ii The Generous's mother's birthday?
Sentence (from "Bolesław II Rogatka"): Bolesław II Rogatka or Bolesław II the Horned, known also as Bolesław II the Bald,( c. 1220/5 – 26/31 December 1278), a member of the Silesian Piasts, was High Duke of Poland briefly in 1241 and Duke of Silesia at Wrocław from 1241 until 1248, when the duchy was divided between him and his brothers.
Relevant evidence: No