General Notes

Humphrey de Bohun IX, KG, born 25 Mar 1342, died 16 Jan 1372/3, Earl of Hereford, Essex, and Northampton; married after 9 Sep 1359, Joan Fitz Alan, died 7 April 1419, daughter of Richard Fitz Alan, Earl of Arundel, and Eleanor Plantagenet, daughter of Henry Plantagenet, Earl of Lancaster (son of Edmund, Earl of Lancaster, son of Henry III), and Maud de Chaworth.  [Magna Charta Sureties]

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Humphrey de Bohun, nephew of Humphrey de Bohun, 7th Earl of Hereford and Earl of Essex, then being a minor at the decease of his uncle, and under the guardianship of Richard, Earl of Arundel. His lordship did not, however, long enjoy this great accumulation of wealth and honour, for he d. in 1372 in the thirty-second year of his age, leaving by his wife, Joane, dau. of his late guardian, the Earl of Arundel, two daus., his co-heirs, viz, Alianore, m. to Thomas of Woodstock, Duke of Gloucester, 6th son of King Edward III; and Mary, m. to Henry, Earl of Derby (son of John of Gaunt, Duke of Lancaster), who afterwards ascended the throne as Henry IV.

Upon the decease of this nobleman, the Earldom of Hereford expired, but his son-in-law, the Earl of Derby, was subsequently created (in 1397) Duke of Hereford, prior, of course, to his becoming King of England, while the lordships of Essex and Northampton and the constableship fell to his other son-in-law, the Duke of Gloucester, and the Earldoms of Essex and Northampton became extinct. [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]