What was the Treaty of Alton?

The Treaty of Alton was an agreement signed in 1101 between Henry Beauclerc and his older brother Robert Curthose in which Robert agreed to recognize Henry as the king of England in exchange for a yearly stipend and other concessions. The agreement temporarily ended a crisis in the succession of the Anglo-Norman kings. ... In the Treaty of Alton, Robert agreed to renounce his claim to the English throne in exchange for a yearly stipend of 3,000 marks and the concession of all but one of Henry's possessions in the Duchy of Normandy. Robert and his followers were allowed to return to Normandy without reprisal from Henry. The two brothers moreover agreed to name each other as heirs and to assist each other in the punishment of traitors. The agreement was not long-lasting. In 1105, Henry invaded Normandy and defeated his brother's army the following year at the Battle of Tinchebray.