Stephen, King of England Robert of Gloucester rebelled against the King, starting the descent into civil war in England. An illegitimate son of Henry I and the half-brother of the Empress Matilda, Robert was one of the most powerful Anglo-Norman barons, controlling estates in Normandy as well as the Earldom of Gloucester. He was known for his qualities as a statesman, his military experience, and leadership ability. Robert had tried to convince Theobald to take the throne in 1135; he did not attend Stephen's first court in 1136 and it took several summons to convince him to attend court at Oxford later that year.
Henry the Young King Henry the Young King Henry the Young King (28 February 1155 – 11 June 1183), was the eldest surviving son of Henry II of England and Eleanor of Aquitaine. Beginning in 1170, he was titular King of England, Duke of Normandy, Count of Anjou and Maine. Henry the Young King was the only King of England since the Norman Conquest to be crowned during his father's reign, but spent his reign frustrated by his father's refusal to grant him meaningful autonomous power. He died aged 28, six years before his father, leaving his brother Richard to become the next king.