Lady Mary Grey Peerage person ID=183417 (d. 1534) Parents Cecily Bonville, 7th Baroness Harington Thomas Grey, 1st Marquess of Dorset Children William Devereux Richard Devereux Henry Devereux Siblings Lord John Grey Lord Edward Grey Bridget Grey George Grey Dorothy Grey Sir Richard Grey Cicely Grey Lady Margaret Grey Anthony Grey Thomas Grey, 2nd Marquess of Dorset Leonard Grey, 1st Viscount Grane Elizabeth Grey, Countess of Kildare Eleanor Grey Partners Walter Devereux, 1st Viscount Hereford