Count Eustace IV of Boulogne (c. 1130 – 17 August 1153) was app... - dofaq.co
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Count Eustace IV of Boulogne (c. 1130 – 17 August 1153) was app...

wikipedia - 22 Aug 2020
Count Eustace IV of Boulogne (c. 1130 – 17 August 1153) was appointed co-king of England by his father, King Stephen, on 6 April 1152, in order to guarantee his succession to the throne (as was the custom in France, but not in England). The Pope and the Church would not agree to this, and Eustace was not crowned. Eustace died the next year aged 23, during his father's lifetime, and so never became king in his own right.[62]

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