Sources

1) Source: The History of Parliament . External Link
http://www.historyofparliamentonline.org/volume/1386-1421/member/devereux-sir-walter-1402. Reference: Devereux, Sir Walter (d.1402), of Weobley, Herefs. (Questionable reliability of evidence)
2) Source: Chancery: Certificates of Statute Merchant and Statute Staple "Debtor: Walter Devereus, knight, and Walter, his son."Dated: 1379. External Link
http://discovery.nationalarchives.gov.uk/details/r/C9688631. Reference: C 241/164/142 (Data from direct source)
3) Source: The visitation of Herefordshire made by Robert Cooke, Clarencieux, in 1569. Reference: Mylbourne, page 90 (Questionable reliability of evidence)
4) Source: Devereux Papers "Bond of Will. Duffeld, Henry Meynant, of Hemyngton [Hemington, co. Northt.], and John Broun, Thomas Cookhill and Robert the Vikarson, of the same, to Agnes Devereux [dau. and heir of Tho. de Crophull, Lord of Hemington, and widow of Sir Walter Devereux, d. 1403] in 20 marks to be paid at Easter next. Dat. Sat. bef. F. of St. Gregory, II Hen.IV. Four seals."Dated: 8 March 1410. External Link
http://discovery.nationalarchives.gov.uk/details/r/85835b6e-94c2-4a68-9aad-9c4c0f42dd5f. Reference: DE/BOX I/5 (Data from secondary evidence)
5) Source: Chancery: Inquisitions Post Mortem, Series I, Henry IV "Walter Devereux, knight: Herefordshire...He held the manor of Weobley in his demesne as of fee with Agnes his wife who survives him. It was held in her right in fee tail...He died on 25 July 1402. Walter his son and next heir was aged 15 years about Christmas last."Dated: 1403. External Link
https://www.british-history.ac.uk/inquis-post-mortem/vol18/pp227-244. Reference: C 137/34/9 (Data from direct source)