What happened to Arthur of Brittany after King John captured him?

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John John of England, from an early 14th-century illumination.

After Arthur I was captured by his uncle, King John, during the battle at Mirebeau-en-Poitou on August 1, 1202, he was taken into custody and imprisoned.1

While the exact circumstances of his death remain a subject of historical tradition, it is widely believed that he was murdered either by John himself or under the King's direct orders. Arthur died around April 3, 1203, in either Rouen or Cherbourg. The act of killing a captive relative and rival is a profound violation of the ethical principles of justice and the sanctity of life, representing a dark chapter in the exercise of royal power.1