 right|thumb|200px|william pleydell-bouverie, 3rd earl of radnor earl of radnor is a title which has been created twice. it was first created in the peerage of england in 1679 for john robartes, 2nd baron robartes, a notable political figure of the reign of charles ii. he was made viscount bodmin at the same time. robartes was the son of richard robartes, who had been created baronet in july 1621george edward cokayne complete baronetage volume 1 1900 and baron robartes, of truro, in the peerage of england in 1626. all three titles became extinct on the death of the fourth earl in 1757. anna maria hunt, great-niece of the fourth earl, married the hon. charles bagenal-agar, youngest son of james agar, 1st viscount clifden of gowran. their son thomas james agar-robartes was created baron robartes in 1869. for more information on this title, see the viscount clifden. the earldom was created for a second time in the peerage of great britain in 1765 when william bouverie, 2nd viscount folkestone, was made earl of radnor. the bouverie family descends from william des bouverie, a prominent london merchant. he was created a baronet, of st catherine cree church, london, in the baronetage of great britain in 1714. his eldest son, the second baronet, represented shaftesbury in the house of commons. he was succeeded by his younger brother, the third baronet. he sat as member of parliament for salisbury until he was raised to the peerage of great britain as baron longford and viscount folkestone in 1747. his son, the second viscount, also represented salisbury in parliament. in 1765 he was made baron pleydell-bouverie, of coleshill in the county of berkshire, and earl of radnor. the earldom was created with remainder, failing heirs male of his body, to the heirs male of his father. both peerages were in the peerage of great britain. he was succeeded by his son, the second earl. he was member of parliament for salisbury and served as lord lieutenant of berkshire. the second earl assumed the additional surname of pleydell after succeeding to the estates of his maternal grandfather, sir mark stuart pleydell, 1st baronet (see pleydell baronets). his son, the third earl, represented downton and salisbury in the house of commons. on his death the titles passed to his son, the fourth earl. 
Earldoms_in_the_Peerage_of_England Earldoms_in_the_Peerage_of_Great_Britain Extinct_earldoms_in_the_Peerage_of_England