Sir Henry de Grey's many offspring include: his second son to whom he left the encumbered manor of Shirland; Sir John Grey, knighted for services to the King's Stewardship of Sherwood Forest, who acquired the estates of Sir John de Huntingfield via his second marriage; his brother William Grey of Cavendish, Landford and Sandiacre, ancestor of the Barons Walsingham, whose ancestral domain remains a catholic shrine and place of pilgrimage; a fourth brother Henry died young; the eldest Richard de Grey inherited the title and estates as Baron Grey of Codnor: a key supporter of Henry of Winchester and the Provençals he was appointed Warden of the Channel Isles, charged with guarding the English coastline against potential French invasion. As well as being Sheriff of Hertfordshire and Essex, Lord Grey played a vital role on the coast of Gascony between 1248 and 1253. However he fell out with the maturing King and his new courtiers, rebelling with De Montfort at the Battle of Lewes; he was captured after Evesham and taken prisoner, forfeited his lands, but in recognition of his blood rights, later restored to rightful inheritance. By 1223 he had married Lucy, daughter and heiress of John de Hume, before dying on 8 September 1271. His son, John de Grey married Lucy, daughter of Sir Raynold de Mohun of Dunster Castle, Somerset by Hawise, daughter of William le Fleming, and may have outlived his aged father by only a few months, leaving a fifteen-year-old boy to inherit.