For 10 points, name this successor to Henry I who ruled England for most of the Anarchy, during which he fought with Empress Matilda.
His brother Henry of Winchester helped crown him. He once saved the life of a rival leader by paying that man's unpaid mercenaries. The Treaty of Durham was signed after his forces won the Battle of the Standard. William of Ypres beat this man's enemies at the Rout of Winchester and captured the half-brother of an enemy this man besieged at Oxford. That victory allowed this man to be exchanged for Robert of Gloucester after he was captured at the Battle of (*) Lincoln. After his siege of Geoffrey of Anjou at Wallingford, he signed the Treaty of Winchester that ended the Nineteen Long Winters and made the future Henry II his successor. For 10 points, name this successor to Henry I who ruled England for most of the Anarchy, during which he fought with Empress Matilda.
His brother Henry of Winchester helped crown him. He once saved the life of a rival leader by paying that man's unpaid mercenaries.
Stephen of Blois, King of England [or Stephen de Blois; or Etienne de Blois]