Ancient Diocese of Saint-Malo

The former Breton and French Catholic Diocese of Saint-Malo (Dioecesis Alethensis, then Dioecesis Macloviensis) existed from at least the 7th century until the French Revolution. Its seat was at Aleth up to some point in the 12th century, when it moved to Saint-Malo. Its territory extended over some of the modern departments of Ille-et-Vilaine, Côtes-d'Armor, and Morbihan. Until the 860s, it was often termed the bishopric of Poutrocoet.

Bishops of Aleth

 * Aaron
 * Suliac
 * Saint Malo or Maclovius 487–565
 * Gurval
 * Colfin oder Colaphin
 * Armael oder Armel
 * Enogat
 * Maëlmon, ca. 650
 * Godefroi or Geofroi c. 656
 * Oedmal
 * Hamon I.
 * Noedi
 * Ritwal
 * Tutamen
 * Ravili
 * Bili I.
 * Meen or Moene
 * Ebon or Edon
 * Guibon or Guibert
 * Hamon II.
 * Walter
 * Cadocanan
 * Rivallon I.
 * Judicaël I.
 * Réginald or Regimond
 * Menfenic
 * Budic or Benedikt
 * Docmaël or Idomaël
 * Johannes
 * Walter
 * Hélogard or Haelocar 811–816
 * Ermorus or Ermor 833–834
 * Iarnwaltus or Jarnuvalt 835–837
 * Main, Maen or Mahen 840–846
 * Salocon c. 848
 * Rethwalatrus or Retuvalart 857–867
 * Ratvomo or Ratwili 867–872
 * Bili II. ca. 880
 * Salvator (tenth century)
 * Rouaud oder Raoul um 990
 * Vakanz 999–1028
 * Hamon III. c. 1028
 * Martin c. 1054
 * Vakanz 1054–1062
 * Renaud or Rainaud c. 1062
 * Vakanz 1062–1085
 * Daniel I. c. 1085
 * Benedict (II.)
 * Judicaël II. 1089–1111
 * Rivallon II. 1112–1118
 * Daniel II. c. 1120
 * Donoald 1120–1143

1146–1400

 * Jean de Châtillon 1146–1163
 * Albert or Aubert 1163–1184
 * Pierre Giraud or Géraud 1184–1218
 * Raoul or Rudolf 1219–1230
 * Geoffroi de Pontual 1231–1255
 * Nicolas de Flac 1254–1262
 * Phillipe de Bouchalampe 1263
 * Simon de Cliçon or Clisson 1264–1286
 * Robert du Pont 1287–1309
 * Raoul Rousselet 1310–1317
 * Alain Gonthier 1318–1333
 * Yves le Prévôt de Bois Boëssel 1333–1348
 * Guillaume Mahé 1348–1349
 * Pierre Benoît or de Guémené 1349–1359
 * Guillaume Poulart 1359–1374
 * Josselin de Rohan 1375–1389
 * Robert de la Motte d'Acigné 1389–1423

1423–1827

 * Guillaume de Montfort 1423–1432
 * Amaury de la Motte d'Acigné 1432–1434
 * Pierre Piédru 1434–1449
 * Jacques d'Espinay-Durestal 1450
 * Jean L'Espervier 1450–1486
 * Pierre de Montfort de Laval 1486–1493
 * Guillaume Briçonnet 1493–1513
 * Denis Briçonnet 1513–1535
 * François Bohier 1535–1569
 * Guillaume Ruzé 1570–1572
 * François Thomé 1573–1586
 * Charles de Bourgneuf 1586–1596
 * Jean du Bec 1598–1610
 * Guillaume le Gouverneur 1610–1630
 * Octavien de Marillac Michel de Paris 1630
 * Achille de Harlay de Sancy 1631–1644
 * Ferdinand de Neufville 1644–1657
 * François de Villemontée 1658–1670
 * Sébastien de Guémadeuc 1671–1702
 * Vincent-François des Maretz 1702–1739
 * Jean-Joseph de Fogasses 1739–1767
 * Antoine-Joseph des Laurents 1767–1785
 * Gabriel Cortois de Pressigny 1785–1790
 * Siméon L'Archant de Grimouville 1817