Template:Wp-Cecilia Underwood, 1st Duchess of Inverness

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Cecilia Underwood, Duchess of Inverness (née Gore, later Buggin, ; – 1 August 1873) was a mistress of Prince Augustus Frederick, Duke of Sussex (sixth son of King George III). Despite marrying, their union was in contravention of the Royal Marriages Act 1772 and as such was considered legally void. Consequently, she could not be styled either as the Duchess of Sussex nor a Princess. She was created Duchess of Inverness, in her own right, by Queen Victoria, on 10 April 1840.