Main
Agnes de Cornouaille was born on an unknown date to Alain Canhiart, Comte de Cornouaille (?-1058) and Judith de Nantes (?-1063) . She married Éon I de Penthièvre (999-1079) .
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-) |
Footnotes (including sources)
| ‡ General |