Question: Who is Czcibor's paternal grandfather?
Sentence (from "Siemomysł"): Siemomysł or Ziemomysł (died) was the third duke of Poland of the Piast dynasty, and the father of Poland's first Christian ruler, Mieszko I. He was listed by Gallus Anonymous in his "Gesta principum Polonorum" and was the son of Lestek, the second known Duke of the Polans.
Relevant evidence: Yes