Before 05 Mar 1451 [her father] William "Black William" Herbert 1st Earl Pembroke (age 28) and [her mother] Anne Devereux (age 21) were married.
In 1461 [her father] William "Black William" Herbert 1st Earl Pembroke (age 38) was created 1st Baron Herbert of Raglan, 1st Baron Herbert of Powis.
Around 1464 Katherine Herbert Countess Kent was born to William "Black William" Herbert 1st Earl Pembroke (age 41) and Anne Devereux (age 34) at Raglan Castle [Map].
In 1468 [her father] William "Black William" Herbert 1st Earl Pembroke (age 45) was created 1st Earl Pembroke.
On 27 Jul 1469 [her father] William "Black William" Herbert 1st Earl Pembroke (age 46) was executed following his capture at the Battle of Edgecote Moor the day before, His son [her brother] William Herbert 2nd Earl Pembroke 1st Earl Huntingdon (age 18) succeeded 2nd Earl Pembroke, 2nd Baron Herbert of Raglan, 2nd Baron Herbert of Powis. Mary Woodville Countess Pembroke and Huntingdon 1456-1481 (age 13) by marriage Countess Pembroke.
Before 1481 [her future husband] George Grey 2nd Earl Kent (age 27) and Anne Woodville Viscountess Bourchier (age 42) were married. See Woodville Marriages. She the daughter of Richard Woodville 1st Earl Rivers and Jacquetta of Luxemburg Duchess Bedford. He the son of Edmund Grey 1st Earl Kent (age 64) and Katherine Percy. He a great x 3 grandson of King Edward III of England. 
Before 1485 George Grey 2nd Earl Kent (age 31) and Katherine Herbert Countess Kent (age 20) were married. She the daughter of William "Black William" Herbert 1st Earl Pembroke and Anne Devereux (age 54). He the son of Edmund Grey 1st Earl Kent (age 68) and Katherine Percy. He a great x 3 grandson of King Edward III of England.
After 1486 [her mother] Anne Devereux (age 56) died.
Before 22 May 1490 [her brother-in-law] Anthony Grey (age 37) and Eleanor Woodville (age 44) were married. See Woodville Marriages. She the daughter of Richard Woodville 1st Earl Rivers and Jacquetta of Luxemburg Duchess Bedford. He the son of Edmund Grey 1st Earl Kent (age 73) and Katherine Percy. He a great x 3 grandson of King Edward III of England.
Before 22 May 1490 [her brother-in-law] Anthony Grey (age 37) died.
On 22 May 1490 [her father-in-law] Edmund Grey 1st Earl Kent (age 73) died. His son [her husband] George Grey 2nd Earl Kent (age 36) succeeded 2nd Earl Kent, 5th Baron Grey of Ruthyn. Katherine Herbert Countess Kent (age 26) by marriage Countess Kent.
Around 1495 [her son] Henry Grey 4th Earl Kent was born to [her husband] George Grey 2nd Earl Kent (age 41) and Katherine Herbert Countess Kent (age 31).
Between 01 Dec 1500 and 08 May 1504 Katherine Herbert Countess Kent (age 40) died.
On 25 Dec 1505 [her former husband] George Grey 2nd Earl Kent (age 51) died. His son [her former step-son] Richard Grey 3rd Earl Kent (age 24) succeeded 3rd Earl Kent, 6th Baron Grey of Ruthyn. Elizabeth Hussey Countess Kent -1516 by marriage Countess Kent.
[her son] Anthony Grey was born to George Grey 2nd Earl Kent and Katherine Herbert Countess Kent.
[her son] George Grey was born to George Grey 2nd Earl Kent and Katherine Herbert Countess Kent.
[her daughter] Anne Grey Baroness Hussey Sleaford was born to George Grey 2nd Earl Kent and Katherine Herbert Countess Kent.
Paternal Family Tree: Herbert
Maternal Family Tree: Elizabeth Merbury
Kings Wessex: Great x 14 Grand Daughter of King Edmund "Ironside" I of England
Kings Gwynedd: Great x 10 Grand Daughter of Owain "Great" King Gwynedd 1100-1170
Kings Seisyllwg: Great x 16 Grand Daughter of Hywel "Dda aka Good" King Seisyllwg King Deheubarth
Kings Powys: Great x 11 Grand Daughter of Maredudd ap Bleddyn King Powys 1047-1132
Kings England: Great x 9 Grand Daughter of King John "Lackland" of England
Kings Scotland: Great x 12 Grand Daughter of Malcolm III King Scotland
Kings Franks: Great x 20 Grand Daughter of Louis "Pious" King Aquitaine I King Franks
Kings France: Great x 14 Grand Daughter of Robert "Pious" II King France
GrandFather: William ap Thomas "Blue Knight of Gwent" Herbert
Father: William "Black William" Herbert 1st Earl Pembroke
Great x 4 Grandfather: Hywel Brecon
Great x 3 Grandfather: Hywel Fychan Brecon
Great x 2 Grandfather: Llewellyn Brecon
Great x 1 Grandfather: Dafydd Gam Brecon
GrandMother: Gwladys ferch Dafydd Gam "Star of Abergavenny" Brecon
Katherine Herbert Countess Kent 1464-1500 9 x Great Grand Daughter of King John "Lackland" of England
Great x 4 Grandfather: Stephen Devereux
Great x 3 Grandfather: Walter "Elder" Devereux
Great x 2 Grandfather: Walter Devereux
Great x 1 Grandfather: Walter Devereux
GrandFather: Walter Devereux 7 x Great Grand Son of King John "Lackland" of England
Great x 3 Grandfather: John Crophull
Great x 2 Grandfather: Thomas Crophull 5 x Great Grand Son of King John "Lackland" of England
Great x 4 Grandfather: Theobald Verdun 2nd Lord Verdun
Great x 3 Grandmother: Margaret Verdun Baroness Hussey 4 x Great Grand Daughter of King John "Lackland" of England
Great x 4 Grandmother: Maud Mortimer Lady Verdun
3 x Great Grand Daughter of King John "Lackland" of England
Great x 1 Grandmother: Agnes Crophull 6 x Great Grand Daughter of King John "Lackland" of England
Mother: Anne Devereux 8 x Great Grand Daughter of King John "Lackland" of England
GrandMother: Elizabeth Merbury