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Group: Kelantan, Malay sultanate of
People: Eustace IV
Topic: Nahāvand, Battle of
Location: Brescello Emilia-Romagna Italy

Eustace IV

Count of Boulogne
Years: 1129 - 1153

Eustace IV (c. 1129 – 17 August 1153), Count of Boulogne, is the eldest son of King Stephen of England and Countess Matilda I of Boulogne.

When his father seizes the English throne on Henry I's death in 1135, he becomes heir apparent to the English throne.