LAPURDENSIS (Labourd - Pyrénées-Atlantiques)Mentioned in the eighth and eleventh centuries, transferred in the twelfth century to Bayonne.
LASCURENSIS (Lescar - Pyrénées-Atlantiques)Probably existing in the fourth century.
LAUDUNENSIS (Laon - Aisne)Probably existing in the sixth century.
LECTURENSIS (Lectoure - Gers)Created in the fourth century.
LEMOVICENSIS (Limoges - Haute-Vienne)Created in the third century.
LEONENSIS (Saint-Pol-de-Léon - Finistère)Created in the fifth century.
LEXOVIENSIS (Lisieux - Calvados)Created in the sixth century.
LINGONENSIS (Langres - Haute-Marne)Created in the third century.
LODOVENSIS (Lodève - Hérault)Probably existing in the third century.
LOMBERIENSIS (Lombez - Gers)Created on the 11 July 1317 by dividing the See of Toulouse.
LUCIONENSIS (Luçon - Vendée)Created on the 13 August 1317 by dividing the See of Poitiers.
LUGDUNENSIS (Lyon - Rhône)Mentioned in about the middle of of the second century.