Duke Exeter
Duke Exeter is in Dukedoms of England Alphabetically.
There have been two creations of Duke Exeter:
1st. 1397. John Holland 1st Duke Exeter 1352-1400. Forfeit. 1461.
2nd. 1416. Thomas Beaufort 1st Duke Exeter 1377-1426. Extinct. 1426.
Duke Exeter (1st Creation)
Duke Exeter is also in Dukedoms of England Chronologically, Forfeit Dukedoms of England.
1st: John Holland 1st Duke Exeter. Died 1400. Forfeit. Son.
2nd: John Holland 2nd Duke Exeter. Died 1447. Son.
3rd: Henry Holland 3rd Duke Exeter. Died 1475. Forfeit.
On 29 Sep 1397 King Richard II (age 30) rewarded his relations with Dukedoms, possibly for their part in downfall of Thomas of Woodstock 1st Duke of Gloucester (deceased), Thomas Beauchamp 12th Earl Warwick (age 59) and Richard Fitzalan 9th Earl Surrey 11th Earl Arundel (deceased) ...
His older half-brother John Holland 1st Duke Exeter (age 45) was created 1st Duke Exeter. Elizabeth Lancaster Duchess Exeter (age 34) by marriage Duchess Exeter.
His nephew Thomas Holland 1st Duke Surrey (age 23) was created 1st Duke Surrey.
His second cousin once removed Thomas Mowbray 1st Duke of Norfolk (age 29) was created 1st Duke Norfolk. Elizabeth Fitzalan Duchess Norfolk (age 31) by marriage Duchess Norfolk.
His first cousin Edward York 2nd Duke of York 1st Duke Albemarle (age 24) was created 1st Duke Albemarle aka Aumale. Beatrice Burgundy Countess Rutland and Cork (age 24) by marriage Duchess Albemarle aka Aumale.
His illegitimate first cousin John Beaufort 1st Marquess Somerset and Dorset (age 24) was created 1st Marquess Somerset, 1st Marquess Dorset. Margaret Holland Duchess Clarence (age 12) by marriage Marchioness Somerset, Marchioness Dorset.
Ralph Neville 1st Earl of Westmoreland (age 33) was created 1st Earl of Westmoreland. Joan Beaufort Countess of Westmoreland (age 18) by marriage Countess of Westmoreland.
On 16 Jan 1400 John Holland 1st Duke Exeter (age 48) was executed at Pleshey Castle [Map]. Duke Exeter forfeit. Joan Fitzalan Countess Essex, Hereford and Northampton (age 53) arranged for the children of her dead brother Richard Fitzalan 9th Earl Surrey 11th Earl Arundel, who had been executed on the orders of John Holland 1st Duke Exeter (age 48) three years before, to witness the execution.
In 1416 John Holland 2nd Duke Exeter (age 20) was restored 2nd Duke Exeter, 2nd Earl Huntingdon.
On 06 Mar 1427 John Holland 2nd Duke Exeter (age 31) and Anne Stafford Duchess Exeter were married. She by marriage Duchess Exeter. She the daughter of Edmund Stafford 5th Earl Stafford and Anne of Gloucester Plantagenet Countess Eu and Stafford (age 44). He the son of John Holland 1st Duke Exeter and Elizabeth Lancaster Duchess Exeter. They were second cousins. He a great grandson of King Edward III of England. She a great granddaughter of King Edward III of England. 
On 20 Jan 1433 John Holland 2nd Duke Exeter (age 37) and Beatrice Aviz Duchess Exeter (age 51) were married. She by marriage Duchess Exeter. She the illegitmate daughter of King John I of Portugal (age 81) and Ines Peres. He the son of John Holland 1st Duke Exeter and Elizabeth Lancaster Duchess Exeter. He a great grandson of King Edward III of England. 
After 25 Oct 1439 John Holland 2nd Duke Exeter (age 44) and Anne Montagu Duchess Exeter (age 39) were married. She by marriage Duchess Exeter. She the daughter of John Montagu 3rd Earl Salisbury and Maud Francis Countess of Salisbury. He the son of John Holland 1st Duke Exeter and Elizabeth Lancaster Duchess Exeter. They were half third cousin once removed. He a great grandson of King Edward III of England. She a great x 3 granddaughter of King Edward "Longshanks" I of England. 
On 05 Aug 1447 John Holland 2nd Duke Exeter (age 52) died at Stepney [Map]. He was buried at the Church of St Katharine's by the Tower [Map]. His son Henry Holland 3rd Duke Exeter (age 17) succeeded 3rd Duke Exeter, 3rd Earl Huntingdon. Anne York Duchess Exeter (age 7) by marriage Duchess Exeter.
On 29 Mar 1461 the Battle of Towton was a decisive victory for King Edward IV of England (age 18) bringing to an end the first war of the Wars of the Roses. Said to be the bloodiest battle on English soil 28000 were killed mainly during the rout that followed the battle.
The Yorkist army was commanded by King Edward IV of England (age 18) with John Mowbray 3rd Duke of Norfolk (age 45), William Neville 1st Earl Kent (age 56), William Hastings 1st Baron Hastings (age 30) (knighted), Walter Blount 1st Baron Mountjoy (age 45), Henry Bourchier 2nd Count Eu 1st Earl Essex (age 57), John Scrope 5th Baron Scrope of Bolton (age 23) and John Wenlock 1st Baron Wenlock (age 61).
The Lancastrian army suffered significant casualties including Richard Percy (age 35), Ralph Bigod Lord Morley (age 50), John Bigod (age 28), Robert Cromwell (age 71), Ralph Eure (age 49), John Neville 1st Baron Neville of Raby (age 51), John Beaumont (age 33), Thomas Dethick (age 61), Everard Simon Digby, William Plumpton (age 25) and William Welles (age 51) who were killed.
Henry Percy 3rd Earl of Northumberland (age 39) was killed. His son Henry Percy 4th Earl of Northumberland (age 12) succeeded 4th Earl of Northumberland, 7th Baron Percy of Alnwick, 15th Baron Percy of Topcliffe. Maud Herbert Countess Northumberland (age 3) by marriage Countess of Northumberland.
Ralph Dacre 1st Baron Dacre Gilsland (age 49) was killed. He was buried at the nearby Saxton church where his chest tomb is extant. Baron Dacre Gilsland extinct. 
Lionel Welles 6th Baron Welles (age 55) was killed. His son Richard Welles 7th Baron Welles, Baron Willoughby (age 33) succeeded 7th Baron Welles.
The Lancastrian army was commanded by Henry Beaufort 2nd or 3rd Duke Somerset (age 25), Henry Holland 3rd Duke Exeter (age 30), Henry Percy 3rd Earl of Northumberland (age 39) and Andrew Trollope.
Henry Holland 3rd Duke Exeter (age 30) was attainted after the battle; Duke Exeter, Earl Huntingdon forfeit.
Those who fought for the Lancaster included William Tailboys 7th Baron Kyme (age 46), John Dudley 1st Baron Dudley (age 60), William Norreys (age 20), Thomas Grey 1st Baron Grey of Richemont (age 43), Robert Hungerford 3rd Baron Hungerford 1st Baron Moleyns (age 30), John Talbot 3rd Earl of Shrewsbury (age 12), Richard Welles 7th Baron Welles, Baron Willoughby (age 33), Richard Woodville 1st Earl Rivers (age 56), James Butler 1st Earl Wiltshire 5th Earl Ormonde (age 40), John Butler 6th Earl Ormonde (age 39), William Beaumont 2nd Viscount Beaumont (age 22), Henry Roos and Thomas Tresham (age 41). Cardinal John Morton (age 41) were captured.
Duke Exeter (2nd Creation)
Duke Exeter is also in Dukedoms of England Chronologically, Extinct Dukedoms of England.
On 18 Nov 1416 Thomas Beaufort 1st Duke Exeter (age 39) was created 1st Duke Exeter by King Henry V of England (age 30) for the remainder of his natural life for 'his service to the king and the realm on both sides of the seas'. At the time the only other dukes were the King's brothers.
On 31 Dec 1426 Thomas Beaufort 1st Duke Exeter (age 49) died at Greenwich, Kent [Map]. Some sources say 27 Dec 1426 and 01 Jan 1427. Duke Exeter and Earl Dorset extinct.