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Isabella Fitzwilliam was the wife of Sir Ranulf Fitzwilliam and the mother of Hugh Fitzwilliam.

In March 1215, she was imprisoned in the dungeon by the Master, in the guise of Sir "Gilles Estram", to ensure her husband's obedience to King John. The Master later freed them, claiming that the Fifth Doctor was manipulating King John of England. (TV: The King's Demons)

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