| HUSBAND |
| Geoffrey "5th Earl of Essex" Mandeville (MFRN-K2D) |
| BIRTH | about 1186 | Saffron Walden, Essex, England |
| DEATH | 23 February 1216 | London, Middlesex, England, of Mortal Wounds At Tournament (Dsp) |
| REF # | | 878455; |
| REF # | | 898933; |
| REF # | | 60; |
| MARRIAGE | 20 January 1214 | |
| FATHER | Sir Geoffrey "4th Earl of Essex" FitzPiers (9SPT-2WQ) |
| MOTHER | Beatrice "Countess of Essex" Say (21RP-QPX) |
| |
| WIFE |
| Isabella "Countess of Gloucester" FitzRobert (MF7F-HQF) |
| BIRTH | about 1160 | Fylingdales, Yorkshire, England |
| DEATH | 14 October 1217 | Somerset, England |
| REF # | | 1278002; |
| REF # | | 1301151; |
| REF # | | 60; |
| MARRIAGE | October 1217 | Hubert "1st Earl of Kent" Burgh (L68X-MRD); England |
| MARRIAGE | 29 August 1189 | John Plantagenet (GT31-8DD); Marlborough Castle, England |
| FATHER | William "2nd Earl of Gloucester" FitzRobert (K2H7-B9K) |
| MOTHER | Hawise "Countess of Leicester" Beaumont (KNXR-916) |