Question: When did Janusz Iii Of Masovia's father die?
Sentence (from "Janusz III of Masovia"): He was a Duke of Czersk, Warsaw, Liw, Zakroczym and Nur during 1503-1524 (under regency until 1518) jointly with his brother, and sole ruler during 1524-1526 as the last male member of the Masovian Piasts.
Relevant evidence: No