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In page Olivia Serres:

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She herself, ten days after her birth, was, she alleged, taken from her mother, and substituted for the still-born child of Robert Wilmot.[1] According to Olive Serres, King George III had learned the truth and had given her £5000 in cash and a yearly pension of £500 for life.[citation needed] She also claimed to have received support from the king of Poland and to have been created the Duchess of Lancaster by George III in May 1773, which, she said, entitled her to the income of the Duchy of Lancaster.[citation needed] In a memorial to George IV, she assumed the title of Princess Olive of Cumberland, placed the royal arms on her carriage and dressed her servants in the royal liveries.[1]