Walter Devereux (1411–1459)
Following the death of Edmund Mortimer, 5th Earl of March, on 18 January 1425, Richard, 3rd Duke of York inherited his estates along the Welsh Marches. This brought Walter Devereux into the retinue of the Duke, and he remained his loyal supporter throughout the War of the Roses. Devereux had been knighted by 22 September 1429 when he first represented Herefordshire in Parliament. He probably was in attendance on the Duke when he travelled with Henry VI to France for his coronation on 16 December 1429. On his return Devereux represented Herefordshire again in Parliament on 16 January 1430. He was listed on the subsidy rolls for Herefordshire of 12 January 1431 as holding his 1/3 of half a fee in Byford.
Walter Devereux, 1st Viscount Hereford
Devereux was first married to Lady Mary Grey (1491- 22 February 1538) prior to his father's death in May 1501, and was pardoned on 15 December 1503 for having married in his father's lifetime and when under marriageable age. She was a daughter of Thomas Grey, 1st Marquess of Dorset and his second wife Cecily, "suo jure" Baroness Harington and Bonville, daughter and heiress of William Bonville, 6th Baron Harington by his wife Katherine Neville, "suo jure" Baroness Hastings. Her maternal grandparents were Alice Montagu, 5th Countess of Salisbury and Sir Richard Neville, "jure uxoris" Earl of Salisbury.