War broke out between Henry II and his three eldest sons in 1173. Following the 1169 Treaty of Montmirail and the crowning of Henry's eldest son,
Henry the Young King, in 1170, his sons had hoped they would begin to enjoy political power and autonomy from their father. The sons, however, grew increasingly frustrated as this did not materialise. In 1173, Henry II bequeathed the castles of
Chinon, Loudun, and Mirabeau to his youngest son,
John, despite them making up part of Henry the Younger's inheritance. There, he was encouraged to start the rebellion and was joined in doing so by his mother,
Eleanor of Aquitaine; his brothers,
Richard (later King of England and known as "the Lionheart") and
Geoffrey; notable barons from
England; and
William I of Scotland. The conflict concluded with a decisive victory for Henry II. William I and Eleanor were both captured and imprisoned. His sons, defeated, were forced to make peace with their father. == The Treaty of Montlouis ==