Question: When did Konrad Ix The Black's father die?
Sentence (from "Konrad V Kantner"): Konrad V Kantner (ca. 1385 – 10 September 1439) was a duke of Oleśnica, Koźle, half of Bytom and half of Ścinawa during 1412–1427 (with his brothers as co-rulers), since 1427 sole ruler over Oleśnica.
Relevant evidence: Yes