Lady Charlotte was the eldest daughter of Algernon Percy, 1st Earl of Beverley, son of Hugh Percy, 1st Duke of Northumberland, and Beverley's wife, Isabella Burrell.

Of their four children, both sons and one daughter predeceased their father, leaving only Lady Elizabeth Sophia Ashburnham, who died unmarried on 13 March 1879, aged 92.

[3] As a result, it was the eldest surviving son of his second marriage who would inherit the earldom.

Lady Charlotte Percy married George Ashburnham, Viscount St Asaph (future Earl of Ashburnham) at Orwell Park, Ipswich, on 25 July 1795.

[8] Another, by Charles Wilkin, is held by the Scottish National Portrait Gallery.