Beatrice de Say was born on an unknown date to William de Say (-1177) and Aufrica nic Uilliam of Scotland (-c1169) and died before 19 April 1197 of unspecified causes. She married Geoffrey Fitz Peter, 1st Earl of Essex (c1162-1213) 25 January 1185 JL .
Children
| Name | Birth | Death | Joined with |
| Geoffrey de Mandeville, 2nd Earl of Essex (-1216) | 23 February 1216 | Isabel de Clare (1226-1264) | |
| William de Mandeville, 3rd Earl of Essex (-1227) | |||
| Henry Fitzgeoffrey (-bef1227) | |||
| Maud Fitzgeoffrey (-1236) | 27 August 1236 | Henry de Bohun, 1st Earl of Hereford (1176-1220) | |
Siblings
| Name | Birth | Death | Joined with |
| Beatrice de Say (-1197) | 19 April 1197 | Geoffrey Fitz Peter, 1st Earl of Essex (c1162-1213) | |
| Maud de Say (-1222) | 1155 England, United Kingdom | 28 March 1222 Westoning, Bedfordshire, England, United Kingdom | William de Boclande (-1216) |
Residences
Footnotes (including sources)
| ‡ General |
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| ₪ Wedding |
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