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Male Henry Ier De Tréguier Click to view Henry Ier De Tréguier in the family tree

Henry Ier was born in 1110.  Henry Ier's father was Etienne Ier De Penthièvre and his mother was Havoise De Guinguamp.  His paternal grandparents were Eudon De Penthièvre and Agnès Ou Onguen De Cornouaille. He had two brothers and three sisters, named Alain II Le Noir, Geoffroi II Botherel, Olive, Agnorie and Théophanie.  He was the second youngest of the six children.  He died at the age of 80 in 1190.


Henry Ier's family with Mahaut De Vendôme

‌Henry Ier and Mahaut were married in a religious ceremony on September 19th, 1151 in , Mayenne, 53,.  They had three sons and two daughters, named Alain Ier, Geslin, Conan Ier, Nobilis and Alix Ière.

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