Sources

1) Source: The Ecclesiastical History of England and Normandy: Volume III “The Countess Adela contributed large sums for the pope's expenses… William, the eldest, married the daughter of Gilo de Sulli… and left a worthy offspring, Odo, Rahier… Theobald, count Palatine… married Matilda, daughter of Duke Ingelbert… As for Stephen, the third son of Stephen de Blois, having been knighted by his uncle Henry, and taken prisoner William count of Mortain at the battle of Tinchebrai, the king granted him that county. He married Matilda, daughter of Eustace count of Boulogne, by his wife Mary ; and in her right inherited all his states” (Data from secondary evidence)