List of the bishops of Tréguier
The diocese of Tréguier goes back to an abbey founded by St. Tugdual in the 6th century; legendary tradition names him as the first bishop of Tréguier.
The following people were bishops of the historic diocese of Tréguier ( France ):
- around 1032: Wilhelm I.
- around 1045: Martin
- around 1086: Hugo I. de Saint-Pabutral
- around 1110 – around 1128: Raoul I.
- around 1150 – around 1175: Wilhelm II.
- 1175-1179: Ives I Hougnon
- 1179 – around 1220: Geoffroi I. Loiz
- around 1224 – around 1237: Stephan
- around 1238: Peter I.
- 1255 – around 1265: Hamon
- around 1266 – around 1271: Alain I. de Lezardrieu
- around 1284: Alain II. de Bruc
- 1286 – around 1310: Geoffroi II. De Tournemine
- around 1317: Jean I. Rigaud
- around 1324: Pierre II. de l'Isle
- 1327-1330: Ives II. Le Prévôt de Bois Boëssel
- 1330-1338: Alain III. de Haïloury
- 1339 – around 1345: Richard du Poirier
- around 1354: Robert I. de Peynel
- 1355-1358: Hugues II. De Monstrelet
- 1358-1362: Alain IV.
- November 28, 1362-1371: Even Bégaignon
- June 12, 1372-1378: Jean II. Brun
- 1378-1383: Thibaud de Malestroit
- 1383-1384: Hugues III. de Keroulay
- 1385-3. May 1401: Pierre III. Morel
- 1401-1403: Ives III. Hirgouët
- 1404-1408: Bernard de Peyron
- 1408-1416: Christophe I. d'Hauterive
- December 15, 1417–1422: Matthieu du Kosker
- April 29, 1422-1430: Jean III. de Bruc
- 1430-27. August 1435: Pierre IV. Piédru (or Predou) (also Bishop of Saint-Malo)
- 1435-1441: Raoul II. Rolland
- May 4, 1442-1453: Jean IV. De Plouec
- March 16, 1454-23. September 1464: Jean V. de Coetquis
- January 8, 1466–1479: Christophe II du Châtel
- 1480–1483: Cardinal Raphaël de Saint-Georges
- 1483-1502: Robert II. Guibé
- 1502-7. March 1505: Jean VI. de Talhouët
- November 22, 1505-16. November 1537: Antoine du Grignaux
- June 14, 1538–1540 or 1541: Louis de Bourbon-Vendôme
- 1541–1544: Cardinal Hippolyte d'Este
- 1544–1545: Jean VII. De Rieux
- June 8, 1545–1547: François I de Manaz
- 1548-27. October 1566: Jean VIII Juvénal des Ursins
- 1566–1572: Claude de Kernovenoy
- 1572–1583: Jean-Baptiste Le Gras
- 1583–1593: François II. De La Tour
- 1593-29. October 1602: Guillaume III. you Halgoët
- 1604-29. July 1616: Georges-Louet-Adrien d'Amboise
- 1616-1620: Pierre V. Cornullier
- 1620-14. September 1635: Gui Champion
- 1636-19. August 1645: Noël des Landes'
- 1646–1679: Balthasar Grangier de Liverdis
- 1679–1686: François-Ignace de Baglion
- 1686-15. May 1694: Eustache Le Sénéchal de Carcado (or Kercado)
- 1694–1731: Olivier Jégou de Kervilio
- 1731–1745: François-Hyacinthe de La Fruglaye de Kervers
- 1746-30. August 1761: Charles-Gui Le Borgne de Kermorvan
- 1761–1766: Joseph-Dominique de Chaylus
- April 26, 1767–1773: Jean-Marc de Royère
- 1773–1775: Jean-Augustin de Frétat de Sarra
- August 6, 1775–1780: Jean-Baptiste-Joseph de Lubersac
- 1780-1790 (1801): Augustin-René-Louis Le Mintier