Question: What is the date of death of Elvira Of Castile, Queen Of Sicily's father?
Sentence (from "Alfonso VI of León and Castile"): The Battle of Sagrajas (1086) and the Battle of Uclés (1108), in which his only son and heir, Sancho Alfónsez died, constituted defeats for the Leonese and Castilian armies.
Relevant evidence: No