Stephen of Brittany, Count Of Treguier, I, Etienne, Comte de Penthièvre

Son of Eudes de Brittany and Agnes of Cornwall , grandson of Geoffrey of Brittany and Hawise of Normandy, Alain Cagniart, Count de Cornuaille and Judith de Nantes. He was a descendant of Richard I Sans Peur, and was the grandfather of Conan IV, Duke of Brittany.

Stephen married Hawise of Guingamp and had the following children:
* Geoffrey II Boterel, Count of Penthièvre
* Alan de Bretagne, 1st Earl of Richmond
* Henry, Count of Tréguier
* Maud, married Walter de Gaunt
* Olive, married Henry de Fougères & William de St. John.
* Theophania, married Rabel de Tancarville, Chamberlain of Normandy
* Eléonore, married Alan de Dinan

Stephen succeeded as the Count of Treguier in 1093, and succeeded his brother, Alain, as Lord of Richmond in 1098. Stephen and Hawise founded the Augustinian abbey of Saint Croix at Guingamp, Brittany, France, and the Cistercian abbey of Begard, Brittany, France, as well as becoming the benefactors of many other religious houses.