Question: When did William Of Winchester, Lord Of Lunenburg's father die?
Sentence (from "William of Winchester, Lord of Lunenburg"): William of Winchester (11 April 1184 – 13 December 1213), also called in English William of Lunenburg  or William Longsword, a member of the House of Welf, was heir to his family's allodial lands in the Duchy of Saxony after the deposition of his father, Duke Henry the Lion in 1180.
Relevant evidence: Yes