General Notes

Henry de Bohun, Magna Charta Surety 1215, son of Humphrey de Bohun IV and Margaret de Huntingdon, born 1176, died 1 Jun 1220, sheriff of Kent, 1st Earl of Hereford 1200-1290, hereditary Constable of England; married Maud Fitz Geoffrey, died 1236, Countess of Essex, daughter of Geoffrey Fitz Piers, died 1213, Earl of Essex, and Beatrix de Say, daughter of William de Say.  [Magna Charta Sureties]

Note: It is not my error in typing (but probably MCS's); Henry appears to have been Earl of Hereford until 1290, which was 70 years after his death!
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Henry de Bohun, who in reality was the 1st Earl of Hereford of this family, being so created by charter of King John, dated 28 April, 1199, but the constableship he inherited from his father. His lordship, taking part with the barons against King John, had his lands sequestered, but they were restored at the signing of Magna Carta, at Runnymede, the earl being one of the twenty-five lords appointed there to enforce the observance of the celebrated charters. His lordship was subsequently excommunicated by the pope and he became a prisoner at the battle of Lincoln in the 1st year of Henry III [1216-17]. He m. Maud, dau. of Geoffrey FitzPiers, Earl of Essex, and eventually heiress of her brother, William de Mandeville, last Earl of Essex of that family, by whom he acquired the honour of Essex and other extensive lordships, ---and had issue, Henry, d. young, Humphrey, and Ralph, and a dau. Margery, who m. Waleran, Earl of Warwick. His lordship d. 1 January 1220 and was s. by his son, Humphrey de Bohun. [Sir Bernard Burke, Dormant and Extinct Peerages, Burke's Peerage, London, 1883, p. 57, Bohun, Earls of Hereford, Earls of Essex, Earls of Northampton, and High Constables of England]