Question: What is the date of death of Henry Ix Of Lubin's father?
Sentence (from "Henry IX of Lubin"): Henry IX of Lubin (1369 – between 9 January 1419 and 10 July 1420), was a Duke of Brzeg (Brieg) during 1399–1400 with his brother and since 1400, Duke of Lubin (Lüben), Chojnów (Haynau) and Oława (Ohlau).
Relevant evidence: No