Robert Ferrers 6th Earl of Derby 1239-1279

Before 1226 [his father] William Ferrers 5th Earl of Derby [aged 32] and [his step-mother] Sibyl Marshal [aged 24] were married. She the daughter of William Marshal 1st Earl Pembroke and Isabel Clare Countess Pembroke. He the son of [his grandfather] William Ferrers 4th Earl of Derby [aged 57] and [his grandmother] Agnes Gernon Countess Derby. They were half third cousin twice removed. He a great x 3 grandson of King Henry I "Beauclerc" England.

In 1238 [his father] William Ferrers 5th Earl of Derby [aged 45] and [his mother] Margaret Quincy Countess Derby were married. She the daughter of [his future brother-in-law] Roger de Quincy 2nd Earl Winchester [aged 43] and [his grandmother] Helen Galloway Countess Winchester. He the son of [his grandfather] William Ferrers 4th Earl of Derby [aged 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 [aged 46] and Margaret Quincy Countess Derby at Tutbury Castle, Staffordshire [Map]. He a great x 4 grandson of King Henry I "Beauclerc" England. Coefficient of inbreeding 1.65%.

In 1247 [his grandfather] William Ferrers 4th Earl of Derby [aged 79] died. His son [his father] William [aged 54] succeeded 5th Earl Derby. [his mother] Margaret Quincy Countess Derby by marriage Countess Derby.

In 1249 Robert Ferrers 6th Earl of Derby [aged 10] and Mary or Marie Lusignan Countess Derby [aged 7] were married. She the daughter of Hugh XI of Lusignan VI Count of La Marche II Count Angoulême [aged 28] and Yolande Capet Countess Lusignan, La Marche and Angoulême [aged 30]. He the son of William Ferrers 5th Earl of Derby [aged 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.

In 1250 [his brother-in-law] William Vaux [aged 35] and [his half-sister] Eleanor Ferrers Countess Winchester [aged 14] were married. The difference in their ages was 21 years. She the daughter of [his father] William Ferrers 5th Earl of Derby [aged 57] and [his step-mother] Sibyl Marshal [aged 49].

On 6th April 1250 [his father-in-law] Hugh XI of Lusignan VI Count of La Marche II Count Angoulême [aged 29] died. His son [his brother-in-law] Hugh [aged 15] succeeded XII Seigneur of Lusignan, VII Count La Marche, III Count Angoulême.

In 1252 [his brother-in-law] Roger de Quincy 2nd Earl Winchester [aged 57] and [his half-sister] Eleanor Ferrers Countess Winchester [aged 16] were married. She by marriage Countess Winchester. The difference in their ages was 41 years. She the daughter of [his father] William Ferrers 5th Earl of Derby [aged 59] and [his step-mother] Sibyl Marshal [aged 51]. He the son of Saer Quincy 1st Earl Winchester and Margaret Beaumont Countess Winchester. They were third cousin once removed. She a great x 4 granddaughter of King Henry I "Beauclerc" England.

In 1253 Gilbert "Red Earl" Clare 7th Earl Gloucester 6th Earl Hertford [aged 9] and [his sister-in-law] Alice or Alix Lusignan Countess Gloucester and Hertford [aged 16] were married. She the daughter of [his father-in-law] Hugh XI of Lusignan VI Count of La Marche II Count Angoulême and [his mother-in-law] Yolande Capet Countess Lusignan, La Marche and Angoulême [aged 34]. He the son of Richard de Clare 6th Earl Gloucester 5th Earl Hertford [aged 30] and Maud Lacy Countess Gloucester and Hertford [aged 29]. They were half fifth 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 29th January 1254 [his brother-in-law] Hugh XII of Lusignan VII Count of La Marche III Count Angoulême [aged 19] and Jeanne Fougères Countess Lusignan Countess La Marche and Angoulême were married. She by marriage Seigneur of Lusignan, Countess La Marche, Countess Angoulême. He the son of [his father-in-law] Hugh XI of Lusignan VI Count of La Marche II Count Angoulême and [his mother-in-law] Yolande Capet Countess Lusignan, La Marche and Angoulême [aged 35].

On 28th March 1254 [his father] William Ferrers 5th Earl of Derby [aged 61] died. He was buried at Merevale Abbey, Warwickshire [Map]. His son Robert [aged 15] succeeded 6th Earl Derby. [his wife] Mary or Marie Lusignan Countess Derby [aged 12] by marriage Countess Derby.

On 14th July 1262 Richard de Clare 6th Earl Gloucester 5th Earl Hertford [aged 39] died. His son Gilbert [aged 18] succeeded 7th Earl Gloucester, 6th Earl Hertford, 9th Lord Clare, 3rd Lord Glamorgan. [his sister-in-law] Alice or Alix Lusignan Countess Gloucester and Hertford [aged 26] by marriage Countess Gloucester, Countess Hertford.

After 15th May 1266 Robert Ferrers 6th Earl of Derby [aged 27] was imprisoned at Windsor Castle [Map].

After 11th July 1266 [his former wife] Mary or Marie Lusignan Countess Derby [deceased] died.

Before 8th September 1267 [his brother-in-law] Roger Leybourne [aged 52] and [his half-sister] Eleanor Ferrers Countess Winchester [aged 31] were married. The difference in their ages was 21 years. She the daughter of [his father] William Ferrers 5th Earl of Derby and [his step-mother] Sibyl Marshal [aged 66].

In or before 1268 [his brother-in-law] Thomas Berkeley 6th and 1st Baron Berkeley [aged 22] and [his sister] Joan Ferrers Baroness Berkeley were married. She the daughter of [his father] William Ferrers 5th Earl of Derby and [his mother] Margaret Quincy Countess Derby. They were half fifth cousins. He a great grandson of King John of England. She a great x 4 granddaughter of King Henry I "Beauclerc" England.

On 26th June 1269 Robert Ferrers 6th Earl of Derby [aged 30] and Eleanor Bohun Countess Derby [aged 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 20th June 1271 [his son] John Ferrers 1st Baron Ferrers of Chartley was born to Robert Ferrers 6th Earl of Derby [aged 32] and [his wife] Eleanor Bohun Countess Derby [aged 28] at Cardiff. He married before 1308 Hawise Muscegros Baroness Ferrers Chartley and had issue.

On 16th October 1274 [his half-sister] Eleanor Ferrers Countess Winchester [aged 38] died.

In 1275 [his brother-in-law] Humphrey Bohun 3rd Earl Hereford 2nd Earl Essex [aged 26] and Maud Fiennes Countess Essex and Hereford [aged 21] were married. She by marriage Countess Essex, Countess Hereford. They were half third cousin three times removed.

On 24th September 1275 Humphrey Bohun 2nd Earl Hereford 1st Earl Essex [aged 71] died at Kenilworth Castle [Map]. He was buried at Llanthony Secunda Priory, Gloucestershire [Map]. His grandson [his brother-in-law] Humphrey [aged 26] succeeded 3rd Earl Hereford, 2nd Earl Essex.

Before 27th April 1279 Robert Ferrers 6th Earl of Derby [aged 40] died. Earl Derby extinct. He was buried at St Thomas' Priory, Stafford [Map].

In 1314 [his former wife] Eleanor Bohun Countess Derby [aged 71] died.

[his daughter] Eleanor Ferrers Baroness Fitzwalter was born to Robert Ferrers 6th Earl of Derby and Eleanor Bohun Countess Derby. She married before 11th March 1290 her half third cousin twice removed Robert Fitzwalter 1st Baron Fitzwalter and had issue.