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Wikipedia
William was at first groomed to inherit the comital thrones of Blois and Chartres, and was designated count shortly before his father's departure on his second crusade in 1102.[2] However he was soon removed from wide-ranging comital duties by his mother, because of his erratic behaviour. He once assaulted and threatened to kill the Bishop of Chartres over a jurisdictional dispute. So, when her second son Theobald came of age, around 1107, Adela elevated him to the position of count of Blois-Chartres,[3] and forced William to retire to his wife's lands in Sully. (2)Crouch 2000, p. 12. (3) LoPrete 2007, p. 216.