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Éon I Bretagne de Penthièvre was born 999 to Geoffroi I de Bretagne (980-1008) and Hawise of Normandy (c978-1034) and died 7 January 1079 of unspecified causes. He married Agnes de Cornouaille (?-?) .
Children
| Name | Birth | Death | Joined with |
| Geoffroy I de Penthièvre (?-1093) | 1093 Dol | ||
| Brian de Penthièvre (?-1072) | 1098 | ||
| Alain de Penthièvre (?-1093) | 1040 | 4 August 1093 | |
| Alain de Penthièvre (?-1098) | 1098 | ||
| Étienne I de Penthièvre (c1060-1135) | 1060 | 1135 | Havoise de Guingamp (1075-) |
| Name | Birth | Death | Joined with |
| Tihern de Châteaubriand (1020-1085) | 1020 | 1085 | Ynoguen de Biré (1020-1065) |
Footnotes (including sources)
| ‡ General |