Henry de Percy, 3rd Baron Percy English baron and High Sheriff of Northumberland (1321–1368) Parents Idonia de Clifford Henry de Percy, 2nd Baron Percy Children Thomas Percy, 1st Earl of Worcester unknown de Percy Henry Percy, 1st Earl of Northumberland Mary de Percy Siblings Thomas Percy Isabel de Percy Robert de Percy Richard de Percy Alianore de Percy Roger de Percy William de Percy Maud Percy Margaret de Percy Partners Mary of Lancaster Joan de Orreby