Guy III of Montlhéry
Guy had the temperament of a warrior, and went on the First Crusade in 1096. He was one of those who deserted the army during the Siege of Antioch (along with his grandfather, Stephen, Count of Blois), and did not dare return directly to France, instead returning home by a long detour through Epirus and Italy.
He had only one child:
- Elizabeth of Montlhéry. In 1103 Elizabeth married Philip, Count of Mantes, son of Philip I of France and Bertrada de Montfort.