Frances Stewart
(1750-1833) nee Pratt, 2nd wife of 1st Marquess of Londonderry · Died at 83
Frances Stewart, Marchioness of Londonderry, was an English aristocrat and mistress of a large landed and politically connected household in late Georgian Ireland.
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From her husband's estate at Mount Stewart, County Down, in the 1790s her circle of friends and acquaintances extended to figures engaged in the democratic politics of the United Irishmen. Correspondence with her stepson, Robert Stewart, Viscount Castlereagh, and with the English peer and politician John Petty, record major political and social developments of her era.