Biography
Mary Grey was born 1491 to Thomas Grey, 1st Marquess of Dorset (1451-1501) and Cecily Bonville, 7th Baroness Harington (1460-1529) and died 22 February 1538 of unspecified causes. She married Walter Devereux, 1st Viscount Hereford (1488-1558) 15 December 1503 JL .
Children
| Name | Birth | Death | Joined with |
| Richard Devereux (c1513-1547) | 1513 | 13 October 1547 | Dorothy Hastings (c1520-1547) |