Parents: William ap Thomas ap Gwilym, Knt., of Raglan, Monmouthshire, Steward of Abergavenny, Chief Steward of the lordships of Usk and Caerleon of Raglan, Monmouthshire, and Gwladus, his second wife, daughter of Dafydd Gam, Knt.
Fighting for the first Yorkist king of England, Edward IV, "Black William of Raglan [had] driven Earl Jasper from the land, taken his title and his earldom [Pembroke] from him, and captured Henry Tudor, and held him prisoner in Raglan."
"Sir William Herbert, 1st Earl of Pembroke, 1st Lord Herbert, was defeated by Lancastrian insurgents at Edgecote Moor and beheaded at Northampton, Northamptonshire 27 July 1469. He was buried at Tintern Abbey. He left a will proved 30 August 1469.
2nd son of Sir William ap Thomas (d.1446) of Raglan Castle and 2nd wife, Gwladys (d.1454)
m. c.1455 Anne Devereux (living 14860 (?). Issue: at least 10.
08 May 1461: Chief Justice and Chamberlain of South Wales
30 Sep 1461: Pembroke Castle surrenders
28 Aug 1467, Chief Justice of North Wales.
14 Aug 1468: takes Harlech Castle
08 Sep 1468: created Earl of Pembroke
24 or 26 July 1469: captured by Robin of Redesdale at Edgcott
1469: Edward IV commissioned Sir William Herbert, Knight, Earl of Pembroke, and his brother, Sir Richard Herbert, Knight of Coldbrook, to command 18,000 Welshmen against rebels. In July of 1469, the army was defeated at the Battle of Edgecote. The Herberts were captured by Richard, Earl of Warwick, and beheaded the next day in Northamptonshire. They were buried in the priory chapel on July 27, 1469, beneath the arch which separates the Herbert Chapel and the choir in St. Mary's Priory Church." 
03 Feb 1461/2: granted castle, town and lordship of Pembroke, with other castles, North Wales 1467
Source: Richardson, Douglas. Royal Ancestry: A Study In Colonial And Medieval Families, in 5 vols. (Salt Lake City, Utah, 2013), Vol, V, page 250.
Walter Devereux, Esq., born about 1412. He married about 1432 Elizabeth Merbury, daughter and heiress of John Merbury, Esq., by his (1st) wife, Alice, daughter and heiress of John Pembridge, Knt., They had two sons, Walter, K.G. [Lord Ferrers of Chartley], and John, Knt., and one daughter, Anne.