• Born: Rohan, Morbihan, Bretagne, France
• Married:
• Died: 1142, Josselin, Morbihan, Bretagne, France

  Research Notes:

Geslin de Bourgogne records that Vicomte Joscelin donated property to the church of Saint-Martin in the castle of Porhoét, assisted by his brothers "Guihenæus, Geoffroy et Alain", by charter dated 1108.

He succeeded his brother before 1114 as Vicomte de Porhoët. "Gauffredus vicecomes de Porrehodio castro et fratres eius Alanus et Bernardus" reached agreement with the abbé of Marmoutiers regarding a donation by "frater suus Jostho vicecomes", by charter dated [1116]. "Gaufredus vicecomes filius Eudonis" donated property to the abbey of Saint-Martin, with the consent of "Alanum vicecomitem fratrem suum", by charter dated 1118, witnessed by "…Bernardus infans frater vicecomitis…". He was given a hundred in Devon by Henry I King of England, recorded in the 1131 Pipe Roll. ²