Question: The title Marquess of Dorset has been created three times in the Peerage of England, it was then created in which year, for Edmund Beaufort, 1st Earl of Dorset?

Context articles: Earl of Southampton
Earl of Ormond (Ireland)
Baron Nugent
John Beaufort, 1st Earl of Somerset
Earl of Guilford
Marquess of Dorset
Edmund Beaufort, 2nd Duke of Somerset
Baron Ferrers of Chartley
Earl of Powis
Earl of Tankerville

Earl of Southampton was a title that was created three times in the Peerage of England.
 The first creation came in 1537 in favour of the courtier William FitzWilliam.
 He was childless and the title became extinct on his death in 1542.
 The second creation came in 1547 in favour of the politician Thomas Wriothesley, 1st Baron Wriothesley, Lord Chancellor between 1544 and 1547.
 He had already been created Baron Wriothesley (pronounced "rose ley" /ˈroʊzli/) in 1544, also in the Peerage of England.
 He was succeeded by his third but only surviving son, the second Earl.
 On his death the titles passed to his second but only surviving son, the third Earl.
 He is best remembered as a patron of William Shakespeare.
 He was succeeded by his second but only surviving son, the fourth Earl.
 He was a prominent statesman and served as Lord High Treasurer under Charles II between 1660 and 1667.
 In 1653 he had succeeded his father-in-law Francis Leigh, 1st Earl of Chichester as second Earl of Chichester according to a special remainder in the letters patent.
 However, Lord Southampton had no sons and the titles became extinct on his death in 1667.
 The third creation came in 1670 for Barbara Palmer, mistress of Charles II.
 She was made Baroness Nonsuch and Duchess of Cleveland at the same time.
 See the latter title for more information on this creation.
The peerage title Earl of Ormond and the related titles Duke of Ormonde and Marquess of Ormonde have a long and complex history.
 An earldom of Ormond has been created three times in the Peerage of Ireland.
 It was originally created in 1328 for James Butler.
 The fifth earl was created Earl of Wiltshire (1449) in the Peerage of England, but he was attainted in 1461 and his peerages were declared forfeit.
 The earldom of Ormond was restored to his younger brother, John Butler, the sixth earl.
 The "de facto", if not indeed the "de jure" earl, Piers Butler, was induced to resign his rights to the title in 1528.
 This facilitated the next creation by awarding the titles of Ormond and Wiltshire to Thomas Boleyn, who was the father of Anne Boleyn.
 At that time, Anne was the mistress of King Henry VIII of England.
 As a maternal grandson of the 7th Earl, Thomas Boleyn had a slim claim to the title.
 Through his daughter, Anne, he was the grandfather of Elizabeth I of England.
 On the death of Boleyn, these peerages of the second creation became extinct because he lacked male heirs, his son George having been executed for treason.
Baron Nugent is a title that has been created three times, twice in the Peerage of Ireland and once in the Peerage of the United Kingdom.
 All three creations are extinct.
 The first creation came in the Peerage of Ireland in 1767 in favour of Robert Craggs-Nugent, who was made Viscount Clare at the same time.
 In 1776 he was further honoured when he was made Earl Nugent.
 For further history of this creation, see Earl Nugent and Viscount Cobham.
 The second creation came in the Peerage of Ireland in 1800 when Mary, Marchioness of Buckingham, was made Baroness Nugent, of Carlanstown in the county of Westmeath, with remainder to her second son Lord George Nugent-Grenville.
 She was the daughter of the first Earl Nugent and the wife of George Nugent-Temple-Grenville, 1st Marquess of Buckingham.
 She was succeeded according to the special remainder by her younger son, Lord George, the second Baron.
 The title became extinct on his death in 1850.
 The third creation came in the Peerage of the United Kingdom on 22 August 1960 when Terence Nugent was made Baron Nugent, of West Harling in the county of Norfolk.
 This creation became extinct on his death in 1973.
John Beaufort, 1st Marquess of Somerset and 1st Marquess of Dorset, later only 1st Earl of Somerset, KG (c. 1373 – 16 March 1410) was an English nobleman and politician.
 He was the first of the four children of John of Gaunt, 1st Duke of Lancaster, and his mistress Katherine Swynford, whom he married in 1396.
 Beaufort's surname probably reflects his father's lordship of Beaufort in Champagne, France.
Earl of Guilford is a title that has been created three times in history.
 The title was created for the first time in the Peerage of England in 1660 (as Countess of Guilford) for Elizabeth Boyle.
 She was a daughter of William Feilding, 1st Earl of Denbigh, and the widow of Lewis Boyle, 1st Viscount Boyle of Kinalmeaky.
 The title was for life only and became extinct on her death in 1667.
 The title was created for a second time in the Peerage of England in 1674 for John Maitland, 1st Duke of Lauderdale.
 For more information on this creation, see the article on him as well as the Earl of Lauderdale.
The title Marquess of Dorset has been created three times in the Peerage of England.
 It was first created in 1397 for John Beaufort, 1st Earl of Somerset, but he lost the title two years later.
 It was then created in 1442 for Edmund Beaufort, 1st Earl of Dorset, who was created Duke of Somerset in 1448.
 That creation was attainted in 1463.
Edmund Beaufort, 2nd Duke of Somerset, KG (1406 – 22 May 1455), sometimes styled 1st Duke of Somerset, was an English nobleman and an important figure in the Wars of the Roses and in the Hundred Years' War.
 He also succeeded in the title of 4th Earl of Somerset and was created 1st Earl of Dorset and 1st Marquess of Dorset (previously held by his father and later forfeited), and Count of Mortain.
 He was known for his deadly rivalry with Richard Plantagenet, 3rd Duke of York.
The title Baron Ferrers of Chartley was created on 6 February 1299 for John de Ferrers, son of Robert de Ferrers, 6th Earl of Derby.
 The daughter of the 6th Baron Ferrers of Chartley, Anne, married Walter Devereux who was summoned to parliament as Lord Ferrers in her right.
 Their descendants became Earls of Essex and so the peerage was also forfeited from 1601 to 1604.
 After the restoration to the title, the 12th Baron died and the peerage fell into abeyance in 1646.
 The abeyance was terminated in 1677 in favour of Robert Shirley.
 In 1711 he was created the 1st Earl Ferrers.
 On the death of his granddaughter, the wife of the 5th Earl of Northampton, the peerage fell into abeyance again.
 When only one of the three daughters of the 14th Baroness Ferrers of Chartley remained, the abeyance of the barony terminated for this daughter, who was the wife of the 1st Marquess Townshend.
 The barony remained still merged with the marquessate until the death of the 3rd Marquess, when it again fell into abeyance between the marquess's two sisters and their heirs.
Earl of Powis (Powys) is a title that has been created three times.
 The first creation came in the Peerage of England in 1674 in favour of William Herbert, 3rd Baron Powis, a descendant of William Herbert, 1st Earl of Pembroke (c.1501–1570).
 In 1687, he was further honoured when he was made Marquess of Powis.
 For more information on this creation of the earldom, which became extinct in 1748, see the latter title.
Earl of Tankerville is a noble title drawn from Tancarville in Normandy.
 The title has been created three times: twice in the Peerage of England, and once (in 1714) in the Peerage of Great Britain for Charles Bennet, 2nd Baron Ossulston.
 His father, John Bennet, 1st Baron Ossulston, was the elder brother of Henry Bennet, 1st Earl of Arlington.