Events
Date of Birth: unknown.
Place of Birth: unknown.
Date of Death: died 1269.
The date is given by Cawley.
Relationships
Father: Walter (II) de Beauchamp (1192/3 - 1236).
This relationship is given by Mason (ODNB).
Mother: Johanna Mortimer (died 1225).
This relationship is given by Mason (ODNB).
Spouse: Isabel Mauduit.
This relationship is given by Coss (ODNB) and by the Complete Peerage (12/2:368).
Children:
(Complete source citations for facts about the children on this page are currently outside of the scope of this project. Most information below comes from Cawley.)
William (IV) de Beauchamp, earl of Warwick, married Maud, daughter of Sir John fitz Geoffrey.
John de Beauchamp.
Walter de Beauchamp.
Joan de Beauchamp married Bartholomew de Sudeley.
Isabel de Beauchamp.
Margaret de Beauchamp married Hubert Hussey.
Sibylla de Beauchamp.
Sarah de Beauchamp married Richard Talbot.
References
Cawley, Charles. “William (IV) de Beauchamp” in Medieval Lands: A prosopography of medieval European noble and royal families.
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).
Coss, Peter. “Beauchamp, William (IV) de, ninth earl of Warwick (c. 1238 - 1298)” in the Oxford Dictionary of National Biography (Oxford University Press, 2004).
Mason, Emma. “Beauchamp, Walter (II) de (1192/3 - 1236)” in the Oxford Dictionary of National Biography (Oxford University Press, 2004).
Nicolas, Nicholas Harris. Testamenta vetusta: being illustrations from wills, of manners, customs, &c. as well as of the descents and possessions of many distinguished families, from the reign of Henry the Second to the accession of Queen Elizabeth. 2 Volumes. (London: Nichols, 1826). An abstract of William's will is given on pp. 50-51