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((short description|Marquessate in the Peerage of Great Britain))

((Use dmy dates|date=April 2022))
((Infobox nobility title
| name              = Marquessate of Hertford
| image             = [[File:Coronet of a British Marquess.svg|100px]]<br />[[File:Marquess of Hertford.svg|130px]] 
| image_size        =  
| alt               =  
| caption           = '''''Arms:''' Sable, on a bend cotised Argent a Rose Gules, between two Annulets of the first <small>(for Conway)</small>; [[Quartering (heraldry)|quartering]] Quarterly, 1st and 4th: Or, on a Pile Gules between six Fleurs-de-lys Azure three [[Lions in heraldry|Lions of England]] (special grant); 2nd and 3rd: Gules, two Wings conjoined in lure Or (Seymour, arms of [[Edward Seymour, 1st Duke of Somerset]] (d.1552)). '''Crests:''' 1st: the Bust of a Moor in profile couped at the shoulders proper, and wreathed about the temples Argent and Azure (Conway). 2nd: out of a Ducal Coronet Or, a Phoenix Or, issuing from of flames proper (Seymour). '''Supporters:''' On either side a Blackamoor wreathed about the temples Or and Sable, habited in short golden garments and in buskins gold, adorned about their waists with red and green feathers, each holding in his exterior hand a Shield Azure, garnished Or, the dexter charged with a Sun-in-Splendour gold, and the sinister with a Crescent Argent.''<ref>((cite book|url=https://debretts.com/|title=Debrett's Peerage|year=1968|page=1036))</ref>

| creation_date     = 5 July 1793 
| creation          = Second 
| monarch           = [[George II of Great Britain|George III]] 
| peerage           = [[Peerage of Great Britain]] 
| baronetage        =  
| first_holder      = [[Francis Seymour-Conway, 1st Marquess of Hertford]] 
| last_holder       =  
| present_holder    = [[Henry Seymour, 9th Marquess of Hertford]] 
| heir_apparent     = William Seymour, Earl of Yarmouth 
| heir_presumptive  =  
| remainder_to      = The 1st Marquess's [[heirs male of the body]] lawfully begotten 
| subsidiary_titles = Earl of Hertford <br /> [[Earl of Yarmouth]] <br /> Viscount Beauchamp <br /> Baron Conway <br /> Baron Conway and Killultagh 
| status            = Extant 
| extinction_date   =  
| family_seat       = [[Ragley Hall]] 
| former_seat       =  
| motto             = '''FIDE ET AMORE''' <br /> ''(By faith and love)'' 
| footnotes         = For the 1st Creation see the [[Duke of Somerset|Dukedom of Somerset]] 
))
The titles of '''Earl of Hertford''' and '''Marquess of Hertford''' have been created several times in the [[peerage]]s of [[Peerage of England|England]] and [[Peerage of Great Britain|Great Britain]].

The third Earldom of Hertford was created in 1559 for [[Edward Seymour, 1st Earl of Hertford|Edward Seymour]], who was simultaneously created '''Baron Beauchamp of Hache'''. His grandson [[William Seymour, 2nd Duke of Somerset|William Seymour]] was subsequently created '''Marquess of Hertford''' and restored to the title of '''Duke of Somerset'''; the Marquessate became extinct in 1675 and the other three titles in 1750.

The present Marquessate was created in 1793.  Lord Hertford holds the subsidiary titles of '''Earl of Yarmouth''' (Peerage of Great Britain, 1793), '''Earl of Hertford''' (Peerage of Great Britain, 1750), '''Viscount Beauchamp''' (Peerage of Great Britain, 1750), '''Baron Conway''', of Ragley in the County of Warwick (Peerage of England, 1703), and '''Baron Conway of Killultagh''', of Killultagh in the County of Antrim ([[Peerage of Ireland]], 1712).  Lord Hertford's heir uses the style ''Earl of Yarmouth''.

The Marquesses of Hertford are members of the [[Seymour family]] headed by the [[Duke of Somerset]]. '''Francis Seymour''' (1679–1732) was the fourth son of [[Sir Edward Seymour, 4th Baronet|Sir Edward Seymour of Berry Pomeroy, 4th Baronet]], a descendant of [[Edward Seymour, 1st Duke of Somerset]] (Sir Edward's grandson [[Edward Seymour, 8th Duke of Somerset|Sir Edward Seymour, 6th Baronet, of Berry Pomeroy]] succeeded as 8th Duke of Somerset in 1750). Upon the death of his elder brother, Francis succeeded to the estates of his relative [[Edward Conway, 1st Earl of Conway]]. In 1703 he was created '''Baron Conway''' in the [[Peerage of England]] and assumed the additional surname of Conway. In 1712 he was created '''Baron Conway of Killultagh''' in the [[Peerage of Ireland]]. In 1750 his son Francis Seymour-Conway, 2nd Baron Conway, was created '''Viscount Beauchamp''' and '''Earl of Hertford'''.<ref>((London Gazette |issue=8975 |date=31 July 1750 |page=2))</ref> These were revivals of titles previously held by the [[Duke of Somerset|Dukes of Somerset]], which had become extinct the same year on the death of Seymour-Conway's kinsman [[Algernon Seymour, 7th Duke of Somerset]]. In 1793 he was further [[honour]]ed when he was made '''Earl of Yarmouth''' and '''Marquess of Hertford'''.<ref>((London Gazette |issue=13541 |date=29 June 1793 |page=543))</ref> The latter title had also previously been held by the [[Duke of Somerset|Dukes of Somerset]], but had become extinct in 1675 (see below).

The family seat is [[Ragley Hall]], near [[Alcester]], [[Warwickshire]].

==Earls of Hertford, First creation (1138)==
*[[Richard Fitz Gilbert de Clare]] (d. 1136), traditionally but erroneously called Earl of Hertford
*[[Gilbert de Clare, 1st Earl of Hertford]] (d. 1153) Son of the above.
*[[Roger de Clare, 2nd Earl of Hertford]] (d. 1173) Brother of the above.
*[[Richard de Clare, 3rd Earl of Hertford]] (d. 1217) Son of the above.
*[[Gilbert de Clare, 4th Earl of Hertford]] (d. 1230) became '''5th Earl of Gloucester''' in 1218
*''For further Earls, mergred with the [[Earl of Gloucester]].''

==Earls of Hertford, Second creation (1537)==
*[[Edward Seymour, 1st Duke of Somerset]], 1st Earl of Hertford (1500–1552), forfeit 1552

==Earls of Hertford, Third creation (1559)==
*[[Edward Seymour, 1st Earl of Hertford]] (1539–1621)
*[[William Seymour, 2nd Duke of Somerset|William Seymour, 2nd Earl of Hertford]] (1587–1660) (became '''Marquess of Hertford''' in 1641)

==Marquesses of Hertford, First creation (1641)==
*[[William Seymour, 2nd Duke of Somerset]], '''1st Marquess of Hertford''', '''2nd Earl of Hertford''' (1587–1660) (restored to the Dukedom of Somerset in 1660)
*[[William Seymour, 3rd Duke of Somerset]], '''2nd Marquess of Hertford''', '''3rd Earl of Hertford''' (1651–1671)
*[[John Seymour, 4th Duke of Somerset]], '''3rd Marquess of Hertford''', '''4th Earl of Hertford''' (died 1675) (Marquessate extinct 1675)

==Earls of Hertford, Third creation (1559; Reverted)==
*[[Francis Seymour, 5th Duke of Somerset]], '''5th Earl of Hertford''' (1658–1678)
*[[Charles Seymour, 6th Duke of Somerset]], '''6th Earl of Hertford''' (1662–1748)
*[[Algernon Seymour, 7th Duke of Somerset]], '''7th Earl of Hertford''' (1684–1750) (Earldom extinct on his death in 1750)

==Barons Conway, Second creation (1703)==
*[[Francis Seymour-Conway, 1st Baron Conway]] (1679–1732)
*[[Francis Seymour-Conway, 1st Marquess of Hertford|Francis Seymour-Conway, 2nd Baron Conway]], (1718–1794) (created '''Earl of Hertford''' in 1750 and '''Marquess of Hertford''' in 1793)

==Earls of Hertford, Fourth creation (1750)==
*[[Francis Seymour-Conway, 1st Marquess of Hertford|Francis Seymour-Conway, 1st Earl of Hertford]], '''1st Viscount Beauchamp''', '''2nd Baron Conway''' (1718–1794) (created '''Marquess of Hertford''' and '''Earl of Yarmouth''' in 1793)

==Marquesses of Hertford, Second creation (1793)==
*[[Francis Seymour-Conway, 1st Marquess of Hertford]] (1718–1794)
*[[Francis Ingram-Seymour-Conway, 2nd Marquess of Hertford]] (1743–1822)
*[[Francis Seymour-Conway, 3rd Marquess of Hertford|Francis Charles Seymour-Conway, 3rd Marquess of Hertford]] (1777–1842)
*[[Richard Seymour-Conway, 4th Marquess of Hertford]] (1800–1870)
*[[Francis Seymour, 5th Marquess of Hertford|Francis Hugh George Seymour, 5th Marquess of Hertford]] (1812–1884)
*[[Hugh Seymour, 6th Marquess of Hertford|Hugh de Grey Seymour, 6th Marquess of Hertford]] (1843–1912)
*[[George Seymour, 7th Marquess of Hertford|George Francis Alexander Seymour, 7th Marquess of Hertford]] (1871–1940)
*[[Hugh Seymour, 8th Marquess of Hertford|Hugh Edward Conway Seymour, 8th Marquess of Hertford]] (1930–1997)
*[[Henry Seymour, 9th Marquess of Hertford|Henry Jocelyn Seymour, 9th Marquess of Hertford]] (b. 1958)

The [[heir apparent]] is the present holder's eldest son, William Francis Seymour, Earl of Yarmouth (b. 1993)<br />
The heir apparent's heir apparent is his eldest son, Clement Andrew Seymour, Viscount Beauchamp (b. 2019)

== Family tree and line of succession ==
((Dukes of Beaufort, Lancaster, and Somerset family tree))
((Collapse top|title=((small|Line of succession (simplified)))))
((tree list))
*[[Image:Coronet of a British Marquess.svg|35px]] ''Francis Seymour-Conway, 1st Marquess of Hertford (1718–1794)''
**''Vice-Admiral [[Lord Hugh Seymour]] (1759–1801)''
***''Admiral of the Fleet Sir [[George Seymour (Royal Navy officer)|George Francis Seymour]] (1787–1870)''
****[[Image:Coronet of a British Marquess.svg|35px]] ''Francis Seymour, 5th Marquess of Hertford (1812–1884)''
*****[[Image:Coronet of a British Marquess.svg|35px]] ''Hugh Seymour, 6th Marquess of Hertford (1843–1912)''
******''Brigadier-General Lord Henry Charles Seymour (1878–1939)''
*******[[Image:Coronet of a British Marquess.svg|35px]] ''Hugh Seymour, 8th Marquess of Hertford (1930–1997)''
********[[Image:Coronet of a British Marquess.svg|35px]] '''Henry Seymour, 9th Marquess of Hertford''' (born 1958)
*********'''(1).''' William Francis Seymour, Earl of Yarmouth (born 1993)
**********'''(2).''' Clement Andrew Seymour, Viscount Beauchamp (born 2019)
**********'''(3).''' Hon. Jocelyn William Seymour (born 2021)
*********'''(4).''' Lord Edward George Seymour (born 1995)
******''Lord George Frederick Seymour (1881–1940)''
*******''Paul de Grey Horatio Seymour (1911–1942)''
********male issue in remainder
*******''George Victor Seymour (1912–1953)''
********male issue in remainder
*****''Lord Victor Alexander Seymour (1859–1935)''
******''Conway Hugh Seymour (1886–1931)''
*******male issue in remainder
******''William John Seymour (1900–1967)''
*******male issue in remainder
***''Hugh Henry John Seymour (1790–1821)''
****''Hugh Horatio Seymour (1821–1892)''
*****''Hugh Francis Seymour (1855–1930)''
******''[[Horace James Seymour]] (1885–1978)''
*******''Hugh Francis Seymour (1926–2010)''
********male issue and descendants in remainder
((tree list/end))
<ref name="DP">((Cite book |title=Debrett's Peerage and Baronetage |publisher=Debrett's Ltd. |year=2019 |isbn=978-1-999767-0-5-1 |editor-last=Morris |editor-first=Susan |edition=150th |volume=1 |location=London |pages=1819–1825 |chapter=Hertford, Marquess of |editor-last2=Bosberry-Scott |editor-first2=Wendy |editor-last3=Belfield |editor-first3=Gervase))</ref>
((collapse bottom))

==See also==
* [[Duke of Somerset]]
* [[Baron Alcester]]
* [[Seymour family]]
* [[Earl of Conway]]

== References ==
((reflist))
((more citations needed|date=November 2021))

==Further reading==
*((cite book | last=Hesilrige | first=Arthur G. M. | date=1921 | title=Debrett's Peerage and Titles of courtesy | url=https://archive.org/details/debrettspeeraget00unse/page/471 | location=160A, [[Fleet street]], [[London]], UK | publisher=[[Dean & Son]] | page=471 ))
* ((usurped|1=[https://web.archive.org/web/20080608023714/http://www.leighrayment.com/peers/peersH3.htm 'Earls and Marquesses of Hertford'])) on Leigh Rayment's Peerage Page. Retrieved 15 December 2009.
((Extant British marquesses))

((DEFAULTSORT:Hertford))
[[Category:Marquessates in the Peerage of Great Britain]]
[[Category:Seymour family|!]]
[[Category:1703 establishments in England]]
[[Category:1793 establishments in Great Britain]]
[[Category:Noble titles created in 1641]]
[[Category:Noble titles created in 1793]]
[[Category:Extinct marquessates in the Peerage of England]]
[[Category:Marquesses of Hertford]]

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