Humphrey de Bohun was Earl of Hereford and Constable of England in right of his mother, if the Chronicles of Llanthony be correct. His lordship m. Margaret of Scotland, dau. of Henry, Earl of Huntingdon, sister of William, King of Scots, and widow of Conan le Petit, Earl of Brittany and Richmond, and was s. by his son, Henry de Bohun, 1st Earl of Hereford. [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]