The titles of Earl of Hertford and Marquess of Hertford have been created several times in the peerages of England and Great Britain.
The present Marquessate was created in 1793. Lord Hertford holds the subsidiary titles of Earl of Hertford (Peerage of Great Britain, 1750), Earl of Yarmouth (Peerage of Great Britain, 1793), 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.
Ralph de Monthermer, Earl of Hertford and Gloucester (d. 1325) (acquired Earldoms through marriage to the widow of the 6th Earl, and lost them on her death in 1307)
Gilbert de Clare, 8th Earl of Hertford, 4th Earl of Gloucester (1291-1314)
Geoffrey de Mandeville was created by king Stephen earl of Essex, William, third earl of Essex, succeeded to the title of earl of Albemarle in right of Hawise, his wife, daughter of William third earl of Albemarle, The titles became extinct at his death 24 November 1190.
Henry Bourchier, earl of Eu in the province of Normandy, was created by king Henry the sixth 1446 viscount Bourchier, and by king Edward the fourth earl of Essex, which titles became extinct in this family upon the death of Henry, second earl of Essex, 13 March 1539.
John Grey was created by king Henry the fifth earl of Tankerville, and succeeded to the title of lord Powis in right of Jane, his wife, daughter of Edward Charlton lord Powis, which titles became extinct by the attainder of Richard third earl of Tankerville 1459.
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, of Berry Pomeroy, a descendant of Edward Seymour, 1st Duke of Somerset (Sir Edward's grandson Sir Edward Seymour, 6th Baronet, of Berry Pomeroy succeeded as 8th Duke of Somerset in 1750).
As a descendant of Edward Seymour, 1st Duke of Somerset, the present Marquess of Hertford is in remainder to the Dukedom of Somerset and its subsidiary title the Barony of Seymour.
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