Humphrey (VI) de Bohun (c. 1249[a] – 31 December 1298), 3rd Earl of Hereford and 2nd Earl of Essex, was an English nobleman known primarily for his opposition to King Edward I over the Confirmatio Cartarum.[1] He was also an active participant in the Welsh Wars and maintained for several years a private feud with the earl of Gloucester.[2] His father, Humphrey (V) de Bohun, fought on the side of the rebellious barons in the Barons' War. When Humphrey (V) predeceased his father, Humphrey (VI) became heir to his grandfather, Humphrey (IV). At Humphrey (IV)'s death in 1275, Humphrey (VI) inherited the earldoms of Hereford and Essex. He also inherited major possessions in the Welsh Marches from his mother, Eleanor de Braose. Bohun's spent most of his early career reconquering Marcher lands captured by Llywelyn ap Gruffudd during the Welsh war in England. This was finally accomplished through Edward I's war in Wales in 1277. Hereford also fought in Wales in 1282–83 and 1294–95. At the same time he also had private feuds with other Marcher lords, and his conflict with Gilbert de Clare, Earl of Gloucester, eventually ended with the personal intervention of King Edward himself. Hereford's final years were marked by the opposition he and Roger Bigod, Earl of Norfolk, mounted against the military and fiscal policy of Edward I. The conflict escalated to a point where civil war threatened, but was resolved when the war effort turned towards Scotland. The king signed the Confirmatio Cartarum – a confirmation of Magna Carta – and Bohun and Bigod agreed to serve on the Falkirk Campaign. Bohun died in 1298, and was succeeded by his son, Humphrey de Bohun, 4th Earl of Hereford.

In 1275 Bohun married Maud de Fiennes, daughter of Enguerrand de Fiennes, chevalier, seigneur of Fiennes, by his 2nd wife, Isabel (kinswoman of Queen Eleanor of Provence). She predeceased him, and was buried at Walden Priory in Essex. Hereford himself died at Pleshey Castle on 31 December 1298, and was buried at Walden alongside his wife.[6] They had one son Humphrey de Bohun, 4th Earl of Hereford, born around 1276.[42] The son was given possession of his father's lands and titles on 16 February 1299.[43] The young Humphrey also inherited his father's title of Constable of England.[44] A common theme in Humphrey de Bohun's actions was his fierce protection of what he regarded as his feudal privileges.[1] His career was marked by turbulence and political strife, particularly in the Marches of Wales, but eventually he left a legacy of consolidated possessions there. In 1297, at the height of the conflict between Edward I and rebellious barons, the king had actively tried to undermine Hereford's authority in the Marches, but failed due to the good relations the earl enjoyed with the local men.[45]