Jisho

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4世 ()
Wikipedia definition
1. Eustace IV, Count of BoulogneEustace IV (c. 1129 – 17 August 1153), count of Boulogne, 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. He was first mentioned in one of his parents' charters dated no later than August 1131.
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