Eustace IV, Count of Boulogne (born 1130)

Eustace IV, Count of Boulogne

Heir apparent of King Stephen of England (died 1153)

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…