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Male Etienne Ier De Penthièvre Click to view Etienne Ier De Penthièvre in the family tree

Etienne Ier was born in 1055.  Etienne Ier's father was Eudon De Penthièvre and his mother was Agnès Ou Onguen De Cornouaille.  His paternal grandparents were Geoffroi-Bérenger Ier De Bretagne and Havoise De Normandie; his maternal grandparents were Alain III Congnard De Cornouaille and Judith De Nantes. He had two half-brothers named Tihern Ou Brient Ier and Robert.  He died at the age of 83 in 1138.


Etienne Ier's family with Havoise De Guinguamp

They had three sons and three daughters, named Alain II Le Noir, Geoffroi II Botherel, Henry Ier, Olive, Agnorie and Théophanie.

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