William de Cantilupe (died 1254)

His chief residences were at Calne in Wiltshire and Aston Cantlow (named after his family), in Warwickshire, until he inherited Abergavenny Castle and the other estates of that lordship.

His uncle was Walter de Cantilupe (1195–1266), Bishop of Hereford and his younger brother was Thomas de Cantilupe (1220–1282), Bishop of Hereford and Chancellor of England, canonised in 1320.

At some time before 15 February 1248 he married his father's ward Eva de Braose (d.1255), a daughter and co-heiress of William V de Braose (d.1230), "Black William", Lord of Abergavenny, by his wife Eva Marshal, daughter and eventual heiress of William Marshall, 1st Earl of Pembroke.

Eva is said to be represented by the surviving recumbent female effigy in the Priory Church of St Mary, Abergavenny (formerly the church of Abergavenny Priory), most of whose body is covered by a large shield sculpted with the arms of Cantilupe ancient (three fleurs-de-lys), and holding a heart in her hands.

One of the chief mourners at his funeral was Simon de Montfort, a close friend of the family.

Arms of William III de Cantilupe: Gules, three fleurs-de-lys or ("Cantilupe Ancient"). These arms are blazoned in Glover's roll of arms [ 1 ] [ non-primary source needed ] and are as depicted by Matthew Paris (d.1259) in his Historia Anglorum , [ 2 ] see below
Arms of William V de Braose (d.1230), as drawn by Matthew Paris (c.1200-1259) in his Historia Anglorum (folio 116): Party per pale indented gules and azure [ 5 ]
Effigy in the Priory Church of St Mary, Abergavenny believed to represent Eva de Braose (d.1255), wife of William III de Cantilupe.
Record of the death of William III de Cantilupe made by Matthew Paris (d.1259) in his Historia Anglorum (folio 165v). [ 19 ] His shield of arms is depicted in the margin inverted