In London on 3/4 August 1791, more than a year after her mother's death, Charlotte married Lord Henry FitzGerald, a member of the Duke of Leinster's family.
Lord Henry FitzGerald (30 July 1761 - 8 July 1829), general; married Charlotte Boyle and had issue, who take by inheritance the surname "de Ros".
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Lord Henry FitzGerald (Kilkea Castle, 9 August 1863 - 31 May 1955), married in Taplow on 21 January 1891 Inez Charlotte Grace Boteler (Taplow, 18 - 1967).