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The Nuttall Encyclopedia
A Roman Catholic lady, maiden name Maria Anne Smythe, with whom, after her second widowhood, George IV., while Prince of Wales, contracted a secret marriage in 1785, which, however, under the Royal Marriage Act, was declared invalid (1756-1837).
Wood, James, ed. Entry for 'Fitzherbert, Mrs.'. The Nuttall Encyclopedia. https://www.studylight.org/encyclopedias/eng/nut/f/fitzherbert-mrs.html. Frederick Warne & Co Ltd. London. 1900.