Eustace IV ruled the County of Boulogne from 1146 until his death. He was the eldest son of King Stephen of England and Countess Matilda I of Boulogne. When his father seized the English throne on Henry I's death in 1135, he became heir apparent to the English throne but predeceased his father.
- Occupation
- feudatory
- Position held
- County of Boulogne
- Citizenship
- Belgium
- Born
- 1130, 1129
- Died
- August 17, 1153
