Question: Who is the paternal grandfather of Jan I Of Opole?
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