REDONENSIS (Rennes - Ille-et-Vilaine)Created in the fifth century.
REGENSIS (Riez - Alpes-de-Haute-Provence)Attested in the fifth century.
REMENSIS (Reims - Marne)Created in the third century.
RIVENSIS (Rieux - Haute-Garonne)Created on the 11 July 1317 by dividing the See of Pamiers.
ROTHOMAGENSIS (Rouen - Seine-Maritime)Founded in the third century.
RUTHENENCIS (Rodez - Aveyron)Founded in the fifth century.