Frances Julia Percy, Duchess of Northumberland (née Burrell; 21 December 1752 – 28 April 1820)[1] was the second wife of Hugh Percy, 2nd Duke of Northumberland, and the mother of the 3rd [2] and 4th Dukes.
Frances was a daughter of the barrister Peter Burrell, of Beckenham, Kent, and his wife, the former Elizabeth Lewis.
She married the future duke, then styled as an earl, in May 1779, shortly after his childless marriage to the former Lady Anne Crichton-Stuart had been dissolved by Act of Parliament.
[4][5] He inherited the dukedom when his father died in 1786, making his wife a duchess.
[5][8] Like her daughter Elizabeth and her sister Isabella, Frances was buried in the Northumberland Vault in Westminster Abbey.