Marquess of Hertford
The titles of Earl of Hertford and Marquess of Hertford have been created several times in the peerages of England and Great Britain.
The third Earldom of Hertford was created in 1559 for Edward Seymour, who was simultaneously created Baron Beauchamp of Hache. His grandson 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, Earl of Hertford, Viscount Beauchamp, Baron Conway, of Ragley in the County of Warwick, and Baron Conway of Killultagh, of Killultagh in the County of Antrim. 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 was the fourth son of Edward Seymour, 4th Baronet|Sir Edward Seymour of Berry Pomeroy, 4th Baronet], a descendant of Edward Seymour, 1st Duke of Somerset. 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. These were revivals of titles previously held by the 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 honoured when he was made Earl of Yarmouth and Marquess of Hertford. The latter title had also previously been held by the Dukes of Somerset, but had become extinct in 1675.
The family seat is Ragley Hall, near Alcester, Warwickshire.
Earls of Hertford, First creation (1138)
- Richard Fitz Gilbert de Clare, traditionally but erroneously called Earl of Hertford
- Gilbert de Clare, 1st Earl of Hertford Son of the above.
- Roger de Clare, 2nd Earl of Hertford Brother of the above.
- Richard de Clare, 3rd Earl of Hertford Son of the above.
- Gilbert de Clare, 4th Earl of Hertford became 5th Earl of Gloucester in 1218
- ''For further Earls, merged with the Earl of Gloucester.''
Earls of Hertford, Second creation (1537)
- Edward Seymour, 1st Duke of Somerset, 1st Earl of Hertford, forfeit 1552
Earls of Hertford, Third creation (1559)
Marquesses of Hertford, First creation (1641)
- William Seymour, 2nd Duke of Somerset, 1st Marquess of Hertford, 2nd Earl of Hertford
- William Seymour, 3rd Duke of Somerset, 2nd Marquess of Hertford, 3rd Earl of Hertford
- John Seymour, 4th Duke of Somerset, 3rd Marquess of Hertford, '''4th Earl of Hertford'''
Earls of Hertford, Third creation (1559; Reverted)
- Francis Seymour, 5th Duke of Somerset, 5th Earl of Hertford
- Charles Seymour, 6th Duke of Somerset, 6th Earl of Hertford
- Algernon Seymour, 7th Duke of Somerset, '''7th Earl of Hertford'''
Barons Conway, Second creation (1703)
Earls of Hertford, Fourth creation (1750)
- Francis Seymour-Conway, 1st Earl of Hertford, 1st Viscount Beauchamp, '''2nd Baron Conway'''
Marquesses of Hertford, Second creation (1793)
- Francis Seymour-Conway, 1st Marquess of Hertford
- Francis Ingram-Seymour-Conway, 2nd Marquess of Hertford
- Francis Charles Seymour-Conway, 3rd Marquess of Hertford
- Richard Seymour-Conway, 4th Marquess of Hertford
- Francis Hugh George Seymour, 5th Marquess of Hertford
- Hugh de Grey Seymour, 6th Marquess of Hertford
- George Francis Alexander Seymour, 7th Marquess of Hertford
- Hugh Edward Conway Seymour, 8th Marquess of Hertford
- Henry Jocelyn Seymour, 9th Marquess of Hertford
The heir apparent's heir apparent is his eldest son, Clement Andrew Seymour, Viscount Beauchamp
Family tree and line of succession
- 35px Francis Seymour-Conway, 1st Marquess of Hertford
- *35px Francis Ingram-Seymour-Conway, 2nd Marquess of Hertford
- **35px Francis Seymour-Conway, 3rd Marquess of Hertford
- ***35px Richard Seymour-Conway, 4th Marquess of Hertford
- *Vice-Admiral Lord Hugh Seymour
- **Admiral of the Fleet Sir George Francis Seymour
- ***35px Francis Seymour, 5th Marquess of Hertford
- ****35px Hugh Seymour, 6th Marquess of Hertford
- *****35px George Seymour, 7th Marquess of Hertford
- *****Brigadier-General Lord Henry Charles Seymour
- ******35px Hugh Seymour, 8th Marquess of Hertford
- *******35px Henry Seymour, 9th Marquess of Hertford
- ********. William Francis Seymour, Earl of Yarmouth
- *********. Clement Andrew Seymour, Viscount Beauchamp
- *********. Hon. Jocelyn William Seymour
- ********. Lord Edward George Seymour
- *********. Henry Philip Seymour
- *****Lord George Frederick Seymour
- ******Paul de Grey Horatio Seymour
- *******male issue in remainder
- ******George Victor Seymour
- *******male issue in remainder
- ****Lord Victor Alexander Seymour
- *****Conway Hugh Seymour
- ******male issue in remainder
- *****William John Seymour
- ******male issue in remainder
- **Hugh Henry John Seymour
- ***Hugh Horatio Seymour
- ****Hugh Francis Seymour
- *****Horace James Seymour
- ******Hugh Francis Seymour
- *******male issue and descendants in remainder
- *Lord George Seymour
- **George Hamilton Seymour
- ***Leopold Richard Seymour
- ****Richard Sturgis Seymour
- *****Leopold Richard Seymour
- ******male issue and descendants in remainder
- *****George FitzRoy Seymour
- ******male issue and descendants in remainder
- ****Sir Edward Seymour
- *****John Edward Seymour
- ******male issue and descendants in remainder
- ****Beauchamp Seymour
- *****Julian Conway Seymour
- ******male issue and descendants in remainder
- ***George Evelyn Seymour
- ****Archibald George Seymour
- *****Evelyn Roger Seymour
- ******male issue and descendants in remainder
- *****Christopher George Seymour
- ******male issue and descendants in remainder
