Frances Percy, Duchess of Northumberland second wife of Hugh Percy, 2nd Duke of Northumberland (1752–1820) Parents Elizabeth Lewis Peter Burrell Children Hugh Percy, 3rd Duke of Northumberland Algernon Percy, 4th Duke of Northumberland Emily Percy Lady Elizabeth Percy Lord Henry Percy Lady Agnes Percy Siblings Emilia Burrell Isabella Percy, Countess of Beverley Peter Burrell, 1st Baron Gwydyr Elizabeth Hamilton Partners Hugh Percy, 2nd Duke of Northumberland