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 (died 1641)
The Earl acknowledged his son and made financial arrangements on his behalf with an addendum to his will in July 1595: "Walter Devereux the base and reputed sonne of the said Robt Erle of Essex, begotten of the body of Eliz: Southwell." The intent of the deed is thought to have been the granting of Essex House to Walter Devereux, but there is no evidence this disposition actually occurred. His only reported manor was that of Lamphey in Pembrokeshire, which comprised just 721 acres and yielded a little over £203 in rents each year. He sold Lamphey manor to Richard Cuny in November 1618, whereupon his half-brother, Robert, 3rd earl of Essex, bestowed upon him the lease of Lamphey rectory. The lack of adequate means was probably the principal cause that Devereux spent most of his adult life in Essex's household in Staffordshire and Westminster, and although he persistently described himself as being ‘of Lamphey’ there is no evidence to suppose that he ever lived there.