Katherine Percy English noblewoman (1423-1475); wife of Edmund Grey, 1st Earl of Kent (1423–1475) Parents Eleanor Percy, Countess of Northumberland Henry Percy, 2nd Earl of Northumberland Children Sir Anthony Grey Lady Elizabeth Grey Lady Anne Grey unknown son Grey unknown daughter Grey George Grey, 2nd Earl of Kent Siblings Thomas Percy, 1st Baron Egremont Ralph Percy William Percy Henry Percy, 3rd Earl of Northumberland John Percy Alan Percy Richard Percy George Percy Lady Joan Percy Partners Edmund Grey, 1st Earl of Kent