Events
Date of Birth: 1256.
Date of Death: 15 December 1286.
Place of Death: Croydon.
The date and place are given by the Complete Peerage (12/1:507). William was either killed in a tournament or murdered there.
Relationships
Father: John de Warenne (1231 - 1304), sixth earl of Surrey and Sussex.
This relationship is given by Waugh (ODNB) and by the Complete Peerage (12/1:507).
Mother: Alice de Lusignan (died 1255/6).
This relationship is given by Waugh (ODNB) and by the Complete Peerage (12/1:507).
Spouse: Joan (died 1293), daughter of Robert de Vere, earl of Oxford.
This relationship is given by Waugh (ODNB) and by the Complete Peerage (12/1:507).
Children:
John de Warenne (30 June 1286 - 29 June 1347), earl of Surrey, married Jeanne de Bar on 25 May 1306.
Alice de Warenne married Edmund FitzAlan, earl of Arundel, in 1305.
References
Cokayne, George Edward, and Vicary Gibbs; et al. The complete peerage of England, Scotland, Ireland, Great Britain and the United Kingdom, extant, extinct, or dormant [2nd ed.]. (London: St. Catherine Press, 1910-59).
Waugh, Scott L. “Warenne, John de, sixth earl of Surrey (1231-1304)” in the Oxford Dictionary of National Biography (Oxford University Press, 2004).
Waugh, Scott L. “Warenne, John de, seventh earl of Surrey (1286-1347)” in the Oxford Dictionary of National Biography (Oxford University Press, 2004; online edn. January 2008).