William d'Aubigny III, Lord of Belvoir, Surety of the Magna Carta 1
- Born: Abt 1146, Belvoir Castle, Belvoir, Leicestershire, England
- Marriage (1): Margery d'Umfraville of Prudhoe
- Died: 1 May 1236, Cainell By Rome, Latium, Italy about age 90
William married Margery d'Umfraville of Prudhoe, daughter of Odinel d'Umfraville and Alice de Lucy. (Margery d'Umfraville of Prudhoe was born about 1160 in Castle Prudhoe, Northumberland, England and died on 20 Sep 1195 in Priory, Belvoir, Leicestershire, England.)
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