Biography of Geoffrey Mandeville 2nd Earl Essex 1191-1216
In 1183 William Fitzrobert 2nd Earl Gloucester died. His daughter [his future wife] Isabella Fitzrobert 3rd Countess Gloucester and Essex (age 10) succeeded 3rd Countess Gloucester.
On 29 Aug 1189 King John "Lackland" of England (age 22) and [his future wife] Isabella Fitzrobert 3rd Countess Gloucester and Essex (age 16) were married at Marlborough Castle [Map]. He by marriage Earl Gloucester. She the daughter of William Fitzrobert 2nd Earl Gloucester and Hawise Beaumont Countess Gloucester. He the son of King Henry "Curtmantle" II of England and Eleanor of Aquitaine Queen Consort Franks and England (age 67). They were half second cousins. She a great granddaughter of King Henry I "Beauclerc" England. 
In or before 1191 [his father] Geoffrey Fitzpeter 1st Earl Essex (age 29) and [his mother] Beatrice Saye were married.
Around 1191 Geoffrey Mandeville 2nd Earl Essex was born to Geoffrey Fitzpeter 1st Earl Essex (age 29) and Beatrice Saye.
In 1199 [his father] Geoffrey Fitzpeter 1st Earl Essex (age 37) was created 1st Earl Essex.
In or before 1205 [his father] Geoffrey Fitzpeter 1st Earl Essex (age 43) and Aveline Clare Countess Essex were married. She by marriage Countess Essex. She the daughter of Roger Clare 2nd Earl Hertford and Maud St Hilary Countess Hertford.
In 1213 [his father] Geoffrey Fitzpeter 1st Earl Essex (age 51) died. His son Geoffrey Mandeville 2nd Earl Essex (age 22) succeeded 2nd Earl Essex. [his future wife] Matilda Clare Countess Essex by marriage Countess Essex.
Before 1214 Geoffrey Mandeville 2nd Earl Essex (age 23) and Matilda Clare Countess Essex were married. He the son of Geoffrey Fitzpeter 1st Earl Essex and Beatrice Saye.
On 20 Jan 1214 Geoffrey Mandeville 2nd Earl Essex (age 23) and Isabella Fitzrobert 3rd Countess Gloucester and Essex (age 41) were married. She by marriage Countess Essex, Countess Gloucester. She the daughter of William Fitzrobert 2nd Earl Gloucester and Hawise Beaumont Countess Gloucester. He the son of Geoffrey Fitzpeter 1st Earl Essex and Beatrice Saye. She a great granddaughter of King Henry I "Beauclerc" England.
On 15 Jun 1215 King John "Lackland" of England (age 48) met with his Baron's at Runnymede [Map] where he agreed to the terms of the Magna Carta which attempted to reduce the King's authority through political reform. Those who signed as surety included:
Roger Bigod 2nd Earl Norfolk (age 71)
his son Hugh Bigod 3rd Earl Norfolk (age 33)
Henry Bohun 1st Earl Hereford (age 39)
Richard Clare 3rd Earl Hertford (age 62)
his son Gilbert Clare 5th Earl Gloucester 4th Earl Hertford (age 35)
William "The Younger" Marshal 2nd Earl Pembroke (age 25)
William Mowbray 6th Baron Thirsk (age 42)
Saer Quincy 1st Earl Winchester (age 45)
Robert Ros (age 43), Richard Percy 5th Baron Percy Topcliffe (age 45)
Robert de Vere 3rd Earl of Oxford (age 50)
Eustace Vesci (age 46)
John Fitzrobert 3rd Baron Warkworth (age 25)
John Lacy Earl Lincoln (age 23).
William D'Aubigny (age 64), Geoffrey Mandeville 2nd Earl Essex (age 24)
William Forz 3rd Earl Albemarle aka Aumale
William Hardell Lord Mayor
William Huntingfield
William Llanvallei
William Malet 1st Baron Curry Mallet
Roger Montbegon, Richard Montfichet
Geoffrey Saye (age 60) signed as surety the Magna Carta.
Ranulf de Blondeville Gernon 6th Earl Chester 1st Earl Lincoln (age 45) witnessed.
On 23 Feb 1216 Geoffrey Mandeville 2nd Earl Essex (age 25) was killed in a tournament. His brother [his brother] William Mandeville 3rd Earl Essex succeeded 3rd Earl Essex.
In Sep 1217 Hubert de Burgh Count Mortain 1st Earl Kent (age 47) and [his former wife] Isabella Fitzrobert 3rd Countess Gloucester and Essex (age 44) were married. She the daughter of William Fitzrobert 2nd Earl Gloucester and Hawise Beaumont Countess Gloucester. She a great granddaughter of King Henry I "Beauclerc" England. 
On 14 Oct 1217 [his former wife] Isabella Fitzrobert 3rd Countess Gloucester and Essex (age 44) died.
Father: Geoffrey Fitzpeter 1st Earl Essex
Geoffrey Mandeville 2nd Earl Essex
Great x 1 Grandfather: William Saye
GrandFather: William Saye
Great x 3 Grandfather: Geoffrey Mandeville
Great x 2 Grandfather: William Mandeville
Great x 3 Grandmother: Adeliza Unknown
Great x 1 Grandmother: Beatrice Mandeville
Great x 3 Grandfather: Eudo Dapifer
Great x 2 Grandmother: Margaret Dapifer
Mother: Beatrice Saye