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In page Olivia Serres:

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In 1820, after her father, her uncle, and King George III had died, she revised her story. James Wilmot, she claimed, had secretly married the Princess Poniatowski, sister of King Stanislaus II of Poland, and their daughter had married the Duke of Cumberland in 1767 at the London house of a nobleman. Olive claimed to be the only child of this marriage,[1] and that her mother had died "of a broken heart" on the Duke of Cumberland's "second" and "bigamous" marriage to Anne Horton.[citation needed]