Events
Date of Birth: unknown.
Place of Birth: unknown.
Date of Death: before 19 April 1197.
The date is given by the Complete Peerage (5:124). Beatrice died “in childbed.”
Place of Burial: Chicksand Priory, later transferred to Shouldham Priory.
The places are given by the Complete Peerage (5:124).
Relationships
Father: William de Say of Kimbolton, Huntingdonshire, and Saham, Norfolk (died shortly before 1 August 1177).
This relationship is given by the Complete Peerage (5:120-121).
Mother: unknown.
Spouse: Geoffrey fitz Peter (died 1213), earl of Essex. Married before 25 January 1184/5.
This relationship is given by West (ODNB) and the Complete Peerage (5:123).
Children:
Geoffrey de Mandeville (died 23 February 1216), earl of Essex, married (1) Matilda, daughter of Robert fitz Walter; married (2) Isabel, daughter of William fitz Robert, earl of Gloucester and divorced wife of king John of England, in January 1214.
William de Mandeville (died 8 January 1227), earl of Essex, married (1) Christine, daughter of Robert fitz Walter.
Henry, dean of Wolverhampton.
Maud (died 27 August 1236) married Henry de Bohun, earl of Hereford.
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) Volume 5.
West, F.J. “Geoffrey fitz Peter, fourth earl of Essex (d. 1213)” in the Oxford Dictionary of National Biography. (Oxford University Press, 2004; online edn, Jan 2008).