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 (?-?) . Notable ancestors include Charlemagne (747-814). Ancestors are from France, Germany, Belgium.


Offspring of Éon I de Penthièvre and Agnes de Cornouaille (?-?)
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-)

Offspring of Éon I de Penthièvre and unknown parent
Name Birth Death Joined with
Tihern de Châteaubriand (1020-1085) 1020 1085 Ynoguen de Biré (1020-1065)

Footnotes (including sources)

‡ General



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