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In page Margaret of Valois:

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On 13 October 1586, Margaret was imprisoned by her brother Henry III in the castle of Usson, in Auvergne. D'Aubiac was executed, despite Catherine de' Medici's wish, in front of Margaret.[6] Margaret assumed she was going to die and in a "farewell" letter to the Queen-Mother, she asked that after her execution a post-mortem be held to prove that she was not, despite gossip, pregnant with d'Aubiac's child.[citation needed]