Anglo-Norman nobleman and soldier
Earl of Essex
Humphrey IV de Bohun, 2nd Earl of Hereford, 1st Earl of Essex (1204 – 24 September 1275) was an Anglo-Norman nobleman and soldier who served as hereditary Constable of England.
Origins.
He was the eldest son and heir of Henry de Bohun, 1st Earl of Hereford (1176–1220) by his wife Maud de Mandeville ("alias" Maud FitzGeoffrey), daughter and heiress of Geoffrey Fitz Peter, 1st Earl of Essex.
Career.
He was one of the nine godfathers of Prince Edward, the future King Edward I. He served as Sheriff of Kent for 1239–40. In 1258, after returning from a pilgrimage to the Holy Land, Humphrey fell away, like his father, from the royal cause to that of the barons. He served as a nominee of the opposition on the "committee of twenty-four" which was appointed in the Oxford Parliament of that year, to create the Provisions of Oxford to reform the administration. The alliance of Simon de Montfort with Llywelyn ap Gruffudd of North Wales brought Bohun back to royal allegiance. He headed the first secession of the Welsh Marchers from the party of the opposition (1263), and was among the captives whom the Montfortians took at the Battle of Lewes in 1264. 
Marriages and issue.
He married twice:
Death and burial.
He died in 1275 in Warwickshire and was buried at Llanthony Secunda in Gloucester. He was succeeded by his grandson Humphrey VI de Bohun (c. 1249 – 1298).