Question: Who is the paternal grandfather of Barbara Of Oleśnica?
Sentence (from "Konrad IX the Black"): Konrad IX the Black (c. 1415 – 14 August 1471) was a duke of Oleśnica, Koźle, half of Bytom and half of Ścinawa since 1450 (with his brothers as co-rulers), and since 1452 sole ruler over Oleśnica, Koźle and half of Bytom.
Relevant evidence: No