Question: What is the date of death of Eustace Iv, Count Of Boulogne's father?
Sentence (from "Eustace IV, Count of Boulogne"): Eustace IV (c. 1127–113517 August 1153), Count of Boulogne, was the eldest son of King Stephen of England and Countess Matilda I of Boulogne.
Relevant evidence: Yes