- 1. Comte Eudes de Bretagne (999-1079) m Orguen Agnes de Cornouaille (1022- )
- 2. Alain de Bretagne (1022-1093)
- 2. Maud de Bretagne (1023-) m Baron Walter I Deincourt (1042-1090)
- 3. Ansgar Brito (1042-)
- 4. Walter Brito (1060-)
- 5. Ansgar Brito (1080-)
- 6. Roger Brito (1100-)
- 7. Simon Le Bret (1125-)
- 8. Richard Le Bret (1150-) Claimed to be the actual slayer of Thomas a Becket in 1170
- 9. Matilda Le Bret (1180-)
- 8. Edmund de Sanford Le Bret (1160-)
- 8. Richard Le Bret (1150-) Claimed to be the actual slayer of Thomas a Becket in 1170
- 7. Unknown Le Breton (1130-)
- 8. Reginald Le Breton (1155- ) Alleged slayer of Thomas a Becket in 1170
- 9. Herbert Le Breton (1180-) Speculative son of the above. Shown by Burke's as receiving in 1236 a pension of 20 sols sterling in the Island of Jersey for damages suffered in his service to the King.
- 10. Alexandre Le Breton (1210-) Seigneur du Franc-Fief au Breton, Jersey, in 1269, holding it from the Abbot of Mont St Michel, who was Seigneur de Noirmont. He and his descendants are said to have pursued a lawsuit against the Abbey for 100 years
- 11. Philippe Le Breton (1240-1291-) son and heir, Seigneur (as above) in 1284
- 12. Guillaume Le Breton (1270- ) successor; Seigneur (as above) in 1309
- 13. Guillaume Le Breton (1305-) successor; Seigneur du Franc-Fief au Breton; Jurat of the Royal Court of Jersey from 1362-1370-
- 14 Unknown Le Breton (1340- )
- 15. Unknown Le Breton (1370-)
- 16. Unknown Le Breton (1400-)
- 17. Thomas Le Breton (1430-1486) Shown by Burke's as grandson or great-grandson of Guillaume. Burke seemingly has a generation missing.
- 18. Jean Le Breton (1460-)
- 19. Jean Le Breton (1485-1545) m Michelle Guerdain (1487-1542)
- 19. Servais Le Breton (1490-1567) m Helen Le Sueur
- 19. Louise Le Breton (1493-) m Philippe de la Rocque (1490-)
- 19. Ambroise Le Breton (1495-1554) m Genette Bisson (1520-1554)
- 19. Perrinne Le Breton (1497-) m Thomas Briard (1495-)
- 19. Drouet Le Breton (1500-1563) m Marie Barbey (1510- )
- 19 Thomasse Le Breton (1505-) m Matthieu Regnault (1505-)
- 18. Jean Le Breton (1460-)
- 17. Raoulin Le Breton (1440-1485)
- 18. Abey Le Breton (1465-)
- 19. Raoulin Le Breton (1500-) m Perrine de Gruchy (1500-)
- 19. Vincenne Le Breton (1500-)
- 18. Abey Le Breton (1465-)
- 17. Thomas Le Breton (1430-1486) Shown by Burke's as grandson or great-grandson of Guillaume. Burke seemingly has a generation missing.
- 16. Unknown Le Breton (1400-)
- 15. Unknown Le Breton (1370-)
- 14 Unknown Le Breton (1340- )
- 13. Guillaume Le Breton (1305-) successor; Seigneur du Franc-Fief au Breton; Jurat of the Royal Court of Jersey from 1362-1370-
- 12. Guillaume Le Breton (1270- ) successor; Seigneur (as above) in 1309
- 11. Philippe Le Breton (1240-1291-) son and heir, Seigneur (as above) in 1284
- 10. Alexandre Le Breton (1210-) Seigneur du Franc-Fief au Breton, Jersey, in 1269, holding it from the Abbot of Mont St Michel, who was Seigneur de Noirmont. He and his descendants are said to have pursued a lawsuit against the Abbey for 100 years
- 9. Herbert Le Breton (1180-) Speculative son of the above. Shown by Burke's as receiving in 1236 a pension of 20 sols sterling in the Island of Jersey for damages suffered in his service to the King.
- 8. Reginald Le Breton (1155- ) Alleged slayer of Thomas a Becket in 1170
- 7. Walter II Brito (1140-)
- 8. Walter III Brito (1160-)
- 7. Simon Le Bret (1125-)
- 6. Roger Brito (1100-)
- 5. Ansgar Brito (1080-)
- 4. Walter Brito (1060-)
- 3. Ansgar Brito (1042-)
- 2. Geoffrey de Penthierve (1046-1093)
- 2. Brien de Bretagne (1048-)
- 2. Bodin de Bretagne (1052-)
- 2. Comte Etienne I de Bretagne (1065-1136) m Hawise de Guingamp (1072-1135)
- 3. Duc Alain V de Bretagne (1088-1146) m Bertha de Bretagne (1122-1167)
- 4. Conan IV de Bretagne (1140-1171) m Margaret of Huntingdon (1144-1201)
- 3. Matilda de Bretagne (1090-) m Gautier de Gand (1080-)
- 3. Olive de Bretagne (1110-1187) m Henry I de Fougeres (1095-1154)
- 3. Eleanor de Penthievre (1095-)
- 3. Theophania de Bretagne (1104-)
- 3. Duc Alain V de Bretagne (1088-1146) m Bertha de Bretagne (1122-1167)
- 2. Ribald de Bretagne (1050-1121)
- 2. Bardolf de Bretagne (1045-1120)
- 3. Akaris FitzBardolf (1080-1161)