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In page Olivia Serres:

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In 1817, Olive wrote a letter to the Prince Regent,[citation needed] claiming that she was the natural daughter of Prince Henry, Duke of Cumberland by Mrs. Olive Payne (who was James Wilmot's sister and her actual aunt). She asked the prince for financial support. In a petition to George III, she put forward her claim to be the natural daughter of the Duke of Cumberland, the king's brother.[1]