Question: What is the cause of death of Agnes Of Aquitaine, Countess Of Savoy's father?
Sentence (from "Agnes of Aquitaine, Countess of Savoy"): Agnes of Aquitaine (c.1052 – after 18 June 1089) was a daughter of William of Poitou, speculated to be William VII, Duke of Aquitaine, whose wife Ermesinde would then have been her mother.
Relevant evidence: Yes