His knowledge of handwriting led to his being subpœnaed on the part of the crown at the trial of Ryves v. the Attorney-General in June 1866, when it was sought without success to establish the claim of Olivia Serres, the mother of Lavinia Ryves, to be the Princess Olive of Cumberland.
After Wilmot's death, his niece, Olivia Serres, claimed that he was the pseudonymous author of the famous Letters of Junius and an influential friend of major writers and politicians.
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Wilmot's biography was written in 1813 by his niece Olivia Serres, who had lived with her bachelor uncle as a child.
Serres became friendly with Lady Anne Hamilton, who had been lady-in-waiting to Queen Caroline, and gained her confidence.
There reportedly was one child, Olivia Wilmot (1772–1834) from this relationship, though the duke's paternity was never proven, and Olivia Wilmot was accused of forging the evidence.
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