The cousin of Mathilda and uncle to Henry II, FTP, name this man who ruled England from 1135 to 1154, the only member of the House of Blois.
He received recognition as king through the machinations of his brother Henry, Bishop of Winchester.  He alienated the Church by his persecution of Roger, Bishop of Salisbury, and succumbed to an unfavorable treaty with Geoffrey of Anjou.  His cousin allied with Robert, Earl of Gloucester and the two invaded England in 1139.  He signed the Treaty of Wallingford, which recognized his cousin's son as heir to the crown after he was captured at the Battle of Lincoln.  The cousin of Mathilda and uncle to Henry II, FTP, name this man who ruled England from 1135 to 1154, the only member of the House of Blois.
He received recognition as king through the machinations of his brother Henry, Bishop of Winchester.  
Stephen of Blois