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What happened when King John captured Arthur of Brittany at Mirebeau?
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John
John of England, from an early 14th-century illumination.
After King John captured his nephew Arthur I, the duke of Brittany, in battle at Mirebeau-en-Poitou on August 1, 1202, the young duke was taken into custody. Following his capture, Arthur was imprisoned. According to historical tradition, he was subsequently murdered either by John himself or under his direct orders.1