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.
Norman invasion of Ireland had the backing of King Henry II of England and was authorized by Pope Adrian IV. In the summer of 1170, there were two further Norman landings, led by Richard "Strongbow" de Clare. By May 1171, Strongbow had assumed control of Leinster and seized the Norse-Irish city kingdoms of Dublin, Waterford, and Wexford. That summer, High King Ruaidrí Ua Conchobair (Rory O'Connor) led an Irish counteroffensive against the Normans, who nevertheless managed to hold most of their conquered territory. In October 1171, King Henry landed with a large army in Ireland to establish control over both the Anglo-Normans and the