Humphrey was the eldest son of Henry de Bohun, first earl of Hereford, and his wife, Matilda (or Maud), daughter of Geoffrey fitz Peter, earl of Essex. His father died in June 1220, and in June the following year, at the petition of King Alexander of Scotland and the barons of England, Humphrey was permitted to succeed to the family estates, concentrated for the most part in the Welsh marches and in Wiltshire, including the castle of Caldicot in Monmouthshire and a share of the honour of Trowbridge.
In February 1225 Humphrey witnessed the reissue of Magna Carta as earl of Hereford, and his title to the third penny of the county of Hereford was confirmed in October 1225, presumably at the same time that he was belted as earl.
He died on 24 September 1275 and was buried at Llanthony (Prima) Priory, in Monmouthshire. Shortly before his death, Humphrey had conveyed the honour of Pleshey to his younger son, Henry de Bohun. The remainder of his estate passed to his grandson, Humphrey (VI) de Bohun (d. 1298), son and heir of Humphrey the younger, who had died in captivity on 27 October 1265, at Beeston Castle, near Chester.
Humphrey was married twice. His first wife was Matilda, daughter of Raoul de Lusignan, count of Eu (d. 1219), whom he had married by 1238 and who brought her husband various lands in Kent. She died on 14 August 1241 and was buried at Llanthony. He married second Matilda of Avebury, who died on 8 October 1273 at Sorges in the Dordogne.
Humphrey had sons named Humphrey, Henry, John, and Savaric, and at least four daughters, including Matilda, the wife of Anselm Marshal, earl of Pembroke.
Oxford Dictionary of National Biography
Magna Carta Ancestry, by Douglas Richardson, publ. 2005
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