Question: When did William, Count Of Sully's father die?
Sentence (from "Stephen, Count of Blois"): Stephen II Henry (in French, "Étienne Henri", in Medieval French, "Estienne Henri"; – 19 May 1102), Count of Blois and Count of Chartres, was the son of Theobald III, count of Blois, and Gersent of Le Mans.
Relevant evidence: Yes