Question: Who is Jan Kropidło's paternal grandfather?
Sentence (from "Bolko III of Strzelce"): Bolko III of Strzelce (also known as of Opole; ; – 21 October 1382) was a Duke of Opole during 1356–1370 (with his brothers as co-rulers) and Duke of Strzelce from 1375 until his death.
Relevant evidence: No