Biography of Thomas Courtenay 13th Earl Devon 1414-1458
Paternal Family Tree: Courtenay
Maternal Family Tree: Alice Sanford Countess of Oxford
Before 1414 [his father] Hugh Courtenay 12th Earl Devon (age 25) and [his mother] Anne Talbot Countess Devon (age 20) were married. He the son of Edward "Blind Earl" Courtenay 11th Earl Devon (age 56) and Maud Camoys Countess Devon. They were third cousins. He a great x 3 grandson of King Edward "Longshanks" I of England. She a great x 3 granddaughter of King Edward "Longshanks" I of England. 
In 1414 Thomas Courtenay 13th Earl Devon was born to Hugh Courtenay 12th Earl Devon (age 25) and Anne Talbot Countess Devon (age 21).
On 05 Dec 1419 [his grandfather] Edward "Blind Earl" Courtenay 11th Earl Devon (age 62) died. His son [his father] Hugh Courtenay 12th Earl Devon (age 30) succeeded 12th Earl Devon, 7th Baron Okehampton, 5th Baron Courtenay. [his mother] Anne Talbot Countess Devon (age 26) by marriage Countess Devon.
Around 1420 Thomas Courtenay 13th Earl Devon (age 6) and Margaret Beaufort Countess Devon (age 11) were married. She the daughter of John Beaufort 1st Marquess Somerset and Dorset and Margaret Holland Duchess Clarence (age 35). He the son of Hugh Courtenay 12th Earl Devon (age 31) and Anne Talbot Countess Devon (age 27). They were third cousins. He a great x 4 grandson of King Edward "Longshanks" I of England. She a great granddaughter of King Edward III of England. 
On 16 Jun 1422 [his father] Hugh Courtenay 12th Earl Devon (age 33) died. His son Thomas Courtenay 13th Earl Devon (age 8) succeeded 13th Earl Devon, 8th Baron Okehampton, 6th Baron Courtenay. [his wife] Margaret Beaufort Countess Devon (age 13) by marriage Countess Devon.
On 19 May 1426, Whitsunday, King Henry VI of England and II of France (age 4) was knighted by his uncles John Lancaster 1st Duke Bedford (age 36) and Humphrey Lancaster 1st Duke Gloucester (age 35) at Leicester, Leicestershire [Map]. Henry then went on to knight Ralph Longford (age 25), Thomas Courtenay 13th Earl Devon (age 12) and Robert Wingfield (age 23).
On 16 Dec 1431 Henry VI (age 10) was crowned II King France: Lancaster at Notre Dame de Paris Cathedral [Map] by Cardinal Henry Beaufort (age 56). A somewhat futile exercise; the last gasps of the Hundred Years War. The ceremony had been arranged by John Lancaster 1st Duke Bedford (age 42). His wife Anne Valois Duchess of Bedford (age 27) attended.
Walter Hungerford 1st Baron Hungerford (age 53) was appointed Carver.
Thomas Harrington (age 31), Richard Archer (age 44), [his father] Hugh Courtenay 12th Earl Devon and his son Thomas (age 17) attended.
In 1432 [his son] Thomas Courtenay 14th Earl Devon was born to Thomas Courtenay 13th Earl Devon (age 18) and [his wife] Margaret Beaufort Countess Devon (age 23). He a great x 2 grandson of King Edward III of England.
In 1435 [his son] John Courtenay 15th Earl Devon was born to Thomas Courtenay 13th Earl Devon (age 21) and [his wife] Margaret Beaufort Countess Devon (age 26) at Okehampton, Devon. He a great x 2 grandson of King Edward III of England.
On 16 Jan 1441 [his mother] Anne Talbot Countess Devon (age 48) died.
In 1449 [his wife] Margaret Beaufort Countess Devon (age 40) died.
Around 1453 Thomas Courtenay 13th Earl Devon (age 39) was imprisoned at Tower of London [Map].
On 15 Dec 1455 the Courtenay family, Earls of Devon since 1355, and Bonville family resolved their differences at the Battle of Clyst Heath. Thomas Courtenay 13th Earl Devon (age 41) defeated William Bonville 1st Baron Bonville (age 63). Battle something of an over-statement; the number of dead reported by one chronicler as being twelve. Following the battle the victorious Courtenay's attacked Bonville's Shute Manor.
After 09 Sep 1456 [his son] Thomas Courtenay 14th Earl Devon (age 24) and [his daughter-in-law] Mary Capet Countess Devon (age 10) were married at Coventry [Map]. She by marriage Countess Devon. She the illegitmate daughter of Charles Valois Anjou Count Maine (age 42). He the son of Thomas Courtenay 13th Earl Devon (age 42) and Margaret Beaufort Countess Devon. He a great x 2 grandson of King Edward III of England.
In 1458 Thomas Courtenay 13th Earl Devon (age 44) died at Yattendon Castle [Map]. He was buried at Courtenay Chantry Chapel Exeter Cathedral. His son [his son] Thomas Courtenay 14th Earl Devon (age 26) succeeded 14th Earl Devon, 9th Baron Okehampton, 7th Baron Courtenay.
[his daughter] Joan Courtenay was born to Thomas Courtenay 13th Earl Devon and Margaret Beaufort Countess Devon. She a great x 2 granddaughter of King Edward III of England.
[his son] Henry Courtenay was born to Thomas Courtenay 13th Earl Devon and Margaret Beaufort Countess Devon. He a great x 2 grandson of King Edward III of England.
Kings Wessex: Great x 12 Grand Son of King Edmund "Ironside" I of England
Kings Gwynedd: Great x 8 Grand Son of Owain "Great" King Gwynedd
Kings Seisyllwg: Great x 14 Grand Son of Hywel "Dda aka Good" King Seisyllwg King Deheubarth
Kings Powys: Great x 9 Grand Son of Maredudd ap Bleddyn King Powys
Kings England: Great x 4 Grand Son of King Edward "Longshanks" I of England
Kings Scotland: Great x 10 Grand Son of Malcolm III King Scotland
Kings Franks: Great x 8 Grand Son of Louis VII King Franks
Kings France: Great x 8 Grand Son of Louis "Fat" VI King France
Great x 4 Grandfather: Hugh Courtenay 3rd Baron Okehampton
4 x Great Grand Son of King Henry I "Beauclerc" England
Great x 3 Grandfather: Hugh Courtenay 9th Earl Devon 5 x Great Grand Son of King Henry I "Beauclerc" England
Great x 4 Grandmother: Eleanor Despencer Baroness Okehampton
4 x Great Grand Daughter of King Henry I "Beauclerc" England
Great x 2 Grandfather: Hugh Courtenay 10th Earl Devon 6 x Great Grand Son of King Henry I "Beauclerc" England
Great x 4 Grandfather: John St John
Great x 3 Grandmother: Agnes St John Countess Devon
Great x 4 Grandmother: Agnes Fitzpiers
Great x 1 Grandfather: Edward Courtenay Great Grand Son of King Edward "Longshanks" I of England
Great x 4 Grandfather: Humphrey Bohun 3rd Earl Hereford 2nd Earl Essex
Great x 3 Grandfather: Humphrey Bohun 4th Earl Hereford 3rd Earl Essex
Great x 4 Grandmother: Maud Fiennes Countess Essex and Hereford
Great x 2 Grandmother: Margaret Bohun Countess Devon Grand Daughter of King Edward "Longshanks" I of England
Great x 4 Grandfather: King Edward "Longshanks" I of England
Son of King Henry III of England
Great x 3 Grandmother: Princess Elizabeth of Rhuddlan Countess Essex, Hereford and Holland Daughter of King Edward "Longshanks" I of England
Great x 4 Grandmother: Eleanor of Castile Queen Consort England 2 x Great Grand Daughter of King Henry "Curtmantle" II of England
GrandFather: Edward "Blind Earl" Courtenay 11th Earl Devon 2 x Great Grand Son of King Edward "Longshanks" I of England
Father: Hugh Courtenay 12th Earl Devon 3 x Great Grand Son of King Edward "Longshanks" I of England
GrandMother: Maud Camoys Countess Devon
Thomas Courtenay 13th Earl Devon 4 x Great Grand Son of King Edward "Longshanks" I of England
Great x 4 Grandfather: Richard Talbot 4th Baron Talbot 5 x Great Grand Son of King Henry I "Beauclerc" England
Great x 3 Grandfather: Gilbert Talbot 1st Baron Talbot 6 x Great Grand Son of King Henry I "Beauclerc" England
Great x 4 Grandmother: Sarah Beauchamp Baroness Talbot
Great x 2 Grandfather: Richard Talbot 2nd Baron Talbot 7 x Great Grand Son of King Henry I "Beauclerc" England
Great x 4 Grandfather: William Boteler
Great x 3 Grandmother: Anne Boteler Baroness Talbot
Great x 4 Grandmother: Angharad Mathrafal
Great x 1 Grandfather: Gilbert Talbot 3rd Baron Talbot 8 x Great Grand Son of King Henry I "Beauclerc" England
Great x 4 Grandfather: John "The Black" Comyn 2nd Lord Baddenoch
Great x 3 Grandfather: John Comyn 3rd Lord Baddenoch 6 x Great Grand Son of King Henry I "Beauclerc" England
Great x 4 Grandmother: Mary or Eleanor Balliol Lady Baddenoch 5 x Great Grand Daughter of King Henry I "Beauclerc" England
Great x 2 Grandmother: Elizabeth Comyn Baroness Talbot 7 x Great Grand Daughter of King Henry I "Beauclerc" England
Great x 4 Grandfather: William de Valence 1st Earl Pembroke
Great x 3 Grandmother: Joan Valence Lady Baddenoch
Great x 4 Grandmother: Joan Munchensi Countess Pembroke
GrandFather: Richard Talbot 7th Baron Strange Blackmere 4th Baron Talbot 2 x Great Grand Son of King Edward "Longshanks" I of England
Great x 4 Grandfather: Theobald Butler
Great x 3 Grandfather: Edmund Butler 1st Earl Carrick
Great x 4 Grandmother: Joan Fitzjohn
Great x 2 Grandfather: James Butler 1st Earl Ormonde
Great x 1 Grandmother: Petronella Butler Great Grand Daughter of King Edward "Longshanks" I of England
Great x 4 Grandfather: Humphrey Bohun 3rd Earl Hereford 2nd Earl Essex
Great x 3 Grandfather: Humphrey Bohun 4th Earl Hereford 3rd Earl Essex
Great x 4 Grandmother: Maud Fiennes Countess Essex and Hereford
Great x 2 Grandmother: Eleanor Bohun Countess Ormonde Grand Daughter of King Edward "Longshanks" I of England
Great x 4 Grandfather: King Edward "Longshanks" I of England Son of King Henry III of England
Great x 3 Grandmother: Princess Elizabeth of Rhuddlan Countess Essex, Hereford and Holland Daughter of King Edward "Longshanks" I of England
Great x 4 Grandmother: Eleanor of Castile Queen Consort England 2 x Great Grand Daughter of King Henry "Curtmantle" II of England
Mother: Anne Talbot Countess Devon 3 x Great Grand Daughter of King Edward "Longshanks" I of England
Great x 4 Grandfather: Robert Strange
Great x 3 Grandfather: Fulk Strange 1st Baron Strange Blackmere
Great x 4 Grandmother: Eleanor Blancminster
Great x 2 Grandfather: John Strange 2nd Baron Strange Blackmere 3 x Great Grand Son of King John "Lackland" of England
Great x 4 Grandfather: John Giffard 1st Baron Giffard Brimpsfield
4 x Great Grand Son of King Henry I "Beauclerc" England
Great x 3 Grandmother: Eleanor Giffard Baroness Strange Blackmere 2 x Great Grand Daughter of King John "Lackland" of England
Great x 4 Grandmother: Maud Clifford
Great Grand Daughter of King John "Lackland" of England
Great x 1 Grandfather: John Strange 4th Baron Strange Blackmere 4 x Great Grand Son of King John "Lackland" of England
Great x 4 Grandfather: William Boteler
Great x 3 Grandfather: William Boteler 1st Baron Wem and Oversley
Great x 4 Grandmother: Angharad Mathrafal
Great x 2 Grandmother: Ankaret Boteler Baroness Strange Blackmere 4 x Great Grand Daughter of King Henry "Curtmantle" II of England
Great x 4 Grandfather: Roger Herdeburgh
Great x 3 Grandmother: Ela Herdeburgh Baroness Wem and Oversley 3 x Great Grand Daughter of King Henry "Curtmantle" II of England
Great x 4 Grandmother: Ida Odingsells Baroness Clinton 2 x Great Grand Daughter of King Henry "Curtmantle" II of England
GrandMother: Ankaret Strange 7th Baroness Strange Blackmere, Baroness Talbot 5 x Great Grand Daughter of King John "Lackland" of England
Great x 4 Grandfather: John Fitzalan 7th Earl Arundel
5 x Great Grand Son of King Henry I "Beauclerc" England
Great x 3 Grandfather: Richard Fitzalan 8th Earl Arundel 3 x Great Grand Son of King John "Lackland" of England
Great x 4 Grandmother: Isabella Mortimer Countess Arundel
2 x Great Grand Daughter of King John "Lackland" of England
Great x 2 Grandfather: Edmund Fitzalan 9th Earl Arundel 4 x Great Grand Son of King John "Lackland" of England
Great x 4 Grandfather: Thomas I Marquess Saluzzo
5 x Great Grand Son of King William "Conqueror" I of England
Great x 3 Grandmother: Alice Saluzzo Countess Arundel 6 x Great Grand Daughter of King William "Conqueror" I of England
Great x 1 Grandmother: Mary Fitzalan Baroness Strange Blackmere 5 x Great Grand Daughter of King John "Lackland" of England
Great x 4 Grandfather: John Warenne 6th Earl Surrey
Great x 3 Grandfather: William Warenne
Great x 4 Grandmother: Alice Lusignan Countess of Surrey
Great x 2 Grandmother: Alice Warenne Countess Arundel
Great x 4 Grandfather: Robert de Vere 5th Earl of Oxford
Great x 3 Grandmother: Joan Vere
Great x 4 Grandmother: Alice Sanford Countess of Oxford