Biography of Robert Ferrers 6th Earl of Derby 1239-1279
Paternal Family Tree: Ferrers
Maternal Family Tree: Mathilde Unknown Countess Évreux 1120-1169
Before 1226 [his father] William Ferrers 5th Earl of Derby (age 33) and [his step-mother] Sibyl Marshal (age 24) were married. She the daughter of William Marshal 1st Earl Pembroke and Isabel Clare Countess Pembroke. He the son of William Ferrers 4th Earl of Derby (age 57) and Agnes Gernon Countess Derby. He a great x 3 grandson of King Henry I "Beauclerc" England. 
In 1238 [his father] William Ferrers 5th Earl of Derby (age 45) and [his mother] Margaret Quincy Countess Derby were married. She the daughter of Roger de Quincy 2nd Earl Winchester (age 43) and Helen Galloway Countess Winchester. He the son of William Ferrers 4th Earl of Derby (age 70) and Agnes Gernon Countess Derby. They were first cousin twice removed. He a great x 3 grandson of King Henry I "Beauclerc" England. She a great x 5 granddaughter of King Henry I "Beauclerc" England.
In 1239 Robert Ferrers 6th Earl of Derby was born to William Ferrers 5th Earl of Derby (age 46) and Margaret Quincy Countess Derby at Tutbury Castle, Staffordshire [Map]. Coefficient of inbreeding 1.65%.
In 1247 [his grandfather] William Ferrers 4th Earl of Derby (age 79) died. His son [his father] William Ferrers 5th Earl of Derby (age 54) succeeded 5th Earl Derby. [his mother] Margaret Quincy Countess Derby by marriage Countess Derby.
In 1249 Robert Ferrers 6th Earl of Derby (age 10) and Mary or Marie Lusignan Countess Derby (age 7) were married. She the daughter of Hugh Lusignan XI Count Lusignan VI Count La Marche II Count Angoulême (age 28) and Yolande Capet Countess Lusignan, La Marche and Angoulême (age 30). He the son of William Ferrers 5th Earl of Derby (age 56) and Margaret Quincy Countess Derby. They were fourth cousins. He a great x 4 grandson of King Henry I "Beauclerc" England. She a great x 5 granddaughter of King Henry I "Beauclerc" England. 
On 28 Mar 1254 [his father] William Ferrers 5th Earl of Derby (age 61) died. He was buried at Merevale Abbey [Map]. His son Robert Ferrers 6th Earl of Derby (age 15) succeeded 6th Earl Derby. [his wife] Mary or Marie Lusignan Countess Derby (age 12) by marriage Countess Derby.
In 1264 [his brother-in-law] Geoffrey Lusignan died.
On 15 May 1266 Henry "Almain" Cornwall (age 30) and John Warenne 6th Earl Surrey (age 35) fought for the King at Chesterfield [Map] during the Battle of Chesterfield. Henry Hastings (age 31), John Clinton, Roger Mandeville, John Eyvil, Baldwin Wake (age 28) all fought on the rebel side. The rebel Robert Ferrers 6th Earl of Derby (age 27) was captured.
After 15 May 1266 Robert Ferrers 6th Earl of Derby (age 27) was imprisoned at Windsor Castle [Map].
After 11 Jul 1266 [his former wife] Mary or Marie Lusignan Countess Derby (age 24) died.
On 31 Oct 1266 the Dictum of Kenilworth was issued. The Dictum was a peace agreement between King Henry III of England (age 59) and the rebels who were besieged in the impregnable Kenilworth Castle [Map]. The committee included:
Bishop Walter Branscombe (age 46).
Archbishop Walter Giffard (age 41).
Gilbert de Clare 8th Earl Gloucester 7th Earl Hertford.
Humphrey Bohun 2nd Earl Hereford 1st Earl Essex (age 62).
Philip Basset (age 82).
John Balliol (age 58).
Robert Walerand.
Alan Zouche (age 63).
Roger Somery 2nd Baron Dudley (age 76), and.
Warin Bassingbourne.
Robert Ferrers 6th Earl of Derby (age 27) and Henry Hastings (age 31) were fined seven times their annual income. The Dictum, however, required the rebels to pay their fines before being restored to their lands; something of a Catch-22 since if they weren't restored to their lands, they would have no income to pay the fine.
On 26 Jun 1269 Robert Ferrers 6th Earl of Derby (age 30) and Eleanor Bohun Countess Derby (age 26) were married. She by marriage Countess Derby. He the son of William Ferrers 5th Earl of Derby and Margaret Quincy Countess Derby. They were third cousin once removed. He a great x 4 grandson of King Henry I "Beauclerc" England.
On 20 Jun 1271 [his son] John Ferrers 1st Baron Ferrers of Chartley was born to Robert Ferrers 6th Earl of Derby (age 32) and [his wife] Eleanor Bohun Countess Derby (age 28) at Cardiff.
Before 06 Nov 1276 Theobald Verdun 1st Lord Verdun (age 28) and [his sister-in-law] Margery Bohun Lady Verdun (age 25) were married. They were second cousin once removed.
Before 27 Apr 1279 Robert Ferrers 6th Earl of Derby (age 40) died. Earl Derby extinct. He was buried at St Thomas' Priory, Stafford [Map].
In 1314 [his former wife] Eleanor Bohun Countess Derby (age 71) died.
[his daughter] Eleanor Ferrers Baroness Fitzwalter was born to Robert Ferrers 6th Earl of Derby and Eleanor Bohun Countess Derby.
Kings Wessex: Great x 7 Grand Son of King Edmund "Ironside" I of England
Kings Gwynedd: Great x 8 Grand Son of Maredudd ab Owain King Deheubarth King Powys King Gwynedd
Kings Seisyllwg: Great x 10 Grand Son of Hywel "Dda aka Good" King Seisyllwg King Deheubarth
Kings Powys: Great x 8 Grand Son of Maredudd ab Owain King Deheubarth King Powys King Gwynedd
Kings England: Great x 4 Grand Son of King Henry I "Beauclerc" England
Kings Scotland: Great x 5 Grand Son of Malcolm III King Scotland
Kings Franks: Great x 14 Grand Son of Louis "Pious" King Aquitaine I King Franks
Kings France: Great x 7 Grand Son of Robert "Pious" II King France
Catherine Parr Queen Consort England x 1
Queen Elizabeth II of the United Kingdom x 40
Queen Consort Camilla Shand x 17
Great x 4 Grandfather: Henry Ferrers
Great x 3 Grandfather: Robert Ferrers 1st Earl of Derby
Great x 4 Grandmother: Bertha Aigle
Great x 2 Grandfather: Robert Ferrers 2nd Earl of Derby
Great x 3 Grandmother: Hawise de Vitre Countess Derby
Great x 1 Grandfather: William Ferrers 3rd Earl of Derby
Great x 4 Grandfather: William Peverell
Great x 3 Grandfather: William "The Younger" Peverell
Great x 4 Grandmother: Adeline Unknown
Great x 2 Grandmother: Margaret Peverell Countess Derby
Great x 4 Grandfather: William Taillebois
Great x 3 Grandmother: Avicia Taillebois
Great x 4 Grandmother: Gundred Warenne Countess Warwick
GrandFather: William Ferrers 4th Earl of Derby
Great x 4 Grandfather: William de Braose 1st Baron Bramber
Great x 3 Grandfather: Phillip de Braose 2nd Baron Bramber
Great x 2 Grandfather: William de Braose 3rd Baron Bramber
Great x 4 Grandfather: Juhel Totnes
Great x 3 Grandmother: Aenor Totnes Baroness Bramber
Great x 1 Grandmother: Sybil de Braose Countess Derby
Great x 4 Grandfather: Walter Gloucester
Great x 3 Grandfather: Miles Gloucester 1st Earl Hereford
Great x 4 Grandmother: Emme or Bertha Balun
Great x 2 Grandmother: Bertha Gloucester Baroness Bramber
Great x 4 Grandfather: Bernard Neufmarché
Great x 3 Grandmother: Sibyl Neufmarché Countess Hereford
Great x 4 Grandmother: Agnes or Nest St John
Father: William Ferrers 5th Earl of Derby 3 x Great Grand Son of King Henry I "Beauclerc" England
Great x 4 Grandfather: Ranulf de Briquessart Gernon Viscount Bessin
Great x 3 Grandfather: Ranulf le Meschin Gernon 3rd Earl Chester
Great x 4 Grandmother: Margaret Avranches
Great x 2 Grandfather: Ranulf Gernon 4th Earl Chester
Great x 3 Grandmother: Lucy Bolingbroke Countess Chester
Great x 1 Grandfather: Hugh de Kevelioc Gernon 5th Earl Chester Great Grand Son of King Henry I "Beauclerc" England
Great x 4 Grandfather: King Henry I "Beauclerc" England
Son of King William "Conqueror" I of England
Great x 3 Grandfather: Robert Normandy 1st Earl Gloucester Son of King Henry I "Beauclerc" England
Great x 2 Grandmother: Matilda Fitzrobert Countess Chester Grand Daughter of King Henry I "Beauclerc" England
Great x 4 Grandfather: Robert Fitzhamon
Great x 3 Grandmother: Mabel Fitzhamon Countess Gloucester
GrandMother: Agnes Gernon Countess Derby 2 x Great Grand Daughter of King Henry I "Beauclerc" England
Great x 4 Grandfather: Simon Montfort
Great x 3 Grandfather: Amaury Montfort Count Évreux
Great x 4 Grandmother: Agnès of Normandy
Great x 2 Grandfather: Simon "Chauve" Montfort 4th Count Évreux
Great x 1 Grandmother: Bertrade Montfort Countess Chester
Great x 2 Grandmother: Mathilde Unknown Countess Évreux
Robert Ferrers 6th Earl of Derby 4 x Great Grand Son of King Henry I "Beauclerc" England
Great x 3 Grandfather: Saer Quincy
Great x 2 Grandfather: Robert Quincy
Great x 4 Grandfather: Simon Senlis 1st Earl of Northampton, Earl of Huntingdon
Great x 3 Grandmother: Maud Senlis
Great x 4 Grandmother: Maud Queen Consort Scotland
Great x 1 Grandfather: Saer Quincy 1st Earl Winchester
GrandFather: Roger de Quincy 2nd Earl Winchester
Great x 4 Grandfather: Robert Beaumont 1st Earl of Leicester Count Meulan
Great x 3 Grandfather: Robert Beaumont 2nd Earl of Leicester
Great x 4 Grandmother: Elizabeth Capet Countess Leicester, Meulan and Surrey
Great x 2 Grandfather: Robert Beaumont 3rd Earl of Leicester
Great x 4 Grandfather: Raoul Gael
Great x 3 Grandmother: Amice Gael Countess Leicester
Great x 1 Grandmother: Margaret Beaumont Countess Winchester
Great x 4 Grandfather: Robert Grandesmil
Great x 3 Grandfather: William Grandesmil
Great x 2 Grandmother: Petronilla Grandesmil Countess Leicester
Mother: Margaret Quincy Countess Derby 5 x Great Grand Daughter of King Henry I "Beauclerc" England
Great x 1 Grandfather: Alan Lord of Galloway
GrandMother: Helen Galloway Countess Winchester 4 x Great Grand Daughter of King Henry I "Beauclerc" England
Great x 4 Grandfather: King David I of Scotland
Great x 3 Grandfather: Henry Dunkeld 3rd Earl Huntingdon 1st Earl of Northumbria
Great x 4 Grandmother: Maud Queen Consort Scotland
Great x 2 Grandfather: David Dunkeld 8th Earl Huntingdon
Great x 4 Grandfather: William Warenne 2nd Earl Surrey
Great x 3 Grandmother: Ada Warenne Countess Huntingdon and Northumbria
Great x 4 Grandmother: Elizabeth Capet Countess Leicester, Meulan and Surrey
Great x 1 Grandmother: Margaret Dunkeld 3 x Great Grand Daughter of King Henry I "Beauclerc" England
Great x 4 Grandfather: Ranulf Gernon 4th Earl Chester
Great x 3 Grandfather: Hugh de Kevelioc Gernon 5th Earl Chester Great Grand Son of King Henry I "Beauclerc" England
Great x 4 Grandmother: Matilda Fitzrobert Countess Chester Grand Daughter of King Henry I "Beauclerc" England
Great x 2 Grandmother: Matilda Gernon Countess Huntingdon 2 x Great Grand Daughter of King Henry I "Beauclerc" England
Great x 4 Grandfather: Simon "Chauve" Montfort 4th Count Évreux
Great x 3 Grandmother: Bertrade Montfort Countess Chester
Great x 4 Grandmother: Mathilde Unknown Countess Évreux