Question: Who is Wenceslaus I Of Zator's paternal grandfather?
Sentence (from "Casimir I of Oświęcim"): Casimir I of Oświęcim  (1396 – 7 April 1434) was a Duke of Oświęcim since 1406 (under regency until 1414), ruler over Toszek (from 1414) and Strzelin (during 1416–1427).
Relevant evidence: No