William d'Aubigny, 3rd Earl of Arundel

William was son of William d'Aubigny, 2nd Earl of Arundel and Matilda de St Hilary, and grandson of Queen Adeliza of Leuven.

William was a favourite of King John. He witnessed King John's concession of the kingdom to the Pope on 15 May 1213. On 14 June 1216 he joined Prince Louis (later Louis VIII of France) after King John abandoned Winchester. He returned to the allegiance of the King Henry III after the Royalist victory at Lincoln, on 14 July 1217.

He joined in the Fifth Crusade (1217–1221), in 1218. He died on his journey home, in Caneill, Italy, near Rome, on 1 February 1221. News of his death reached England on 30 March 1221. He was brought home and buried at Wymondham Abbey.

His title was held by his son William, until he died, childless, in 1224, when it was passed to William's youngest son Hugh.

After 1196 and before 1200 William married Mabel of Chester (born c. 1173), daughter of Hugh de Kevelioc, 5th Earl of Chester, and Bertrade de Montfort. They were the parents of eight children.

• Avice de Aubigny (1196–1214), the wife of William Mowbray
• Maud d'Aubigny, (d.aft 1210), the wife of Robert de Tateshal
• Cicely d'Aubigny married Roger de Mahaut of Elford (d.1260)
• Colette d'Aubigny (d.aft 1233)
• William d'Aubigny, 4th Earl of Arundel (d. 1224); buried Wymondham Abbey
• Hugh d'Aubigny, 5th Earl of Arundel (d. 7 May 1243); buried Wymondham Abbey
• Isabel d'Aubigny; married John Fitzalan, Lord of Oswestry
• Nicole or Nichole d'Aubigny (d.abt 1240); married Roger de Somery, Baron Somery of Dudley Castle (died 26 August 1273), son of Ralph de Somery (died 1211).
• Lady Mabel d'Albini(1240-1330)married Robert de Tattershall