Richard de Grey of Codnor who died in 1271, had married Lucy, the daughter and heir of John de Humet. It is thought that Grey was a descendant of William de Humet, Constable of Normandy and grandson of Odo, the Bishop of Bayeux, half-brother of William I, England's first Norman king, and an ancestor of the Lords Grey of Codnor Humet.

Richard de Grey became governor of the Channel Islands and later constable of Dover Castle and Warden of the Cinque Ports. He was a brother of John de Grey of Codnor, who also died between 1271/2, and married a Lucy, the daughter of Sir Renold de Mohun of Dunster.

A nephew of Richard by John and Lucy de Grey was Henry of Grays, Aylesford and Hoo, who was called to Parliament and is thus reasoned to have been known as the 1st Baron Grey of Codnor. He wed first Elenor, a sister of Hugh de Courtenay, the 1st Earl of Devon. Henry had a sister Lucia, who wed a son of Roger de Somerie. Henry de Grey was in the 6th year of the reign of King Richard I granted the manor of Thurrock, in Essex, which was confirmed by King John. By 1201 he held Manor of Codnor in Derbyshire, and in 1216 had been further granted the Manor of Grimston. He wed to Isolda, a daughter of Robert Bardolf.

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