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In 1173 Henry the Young King, eldest living son and heir of King Henry II Plantagenet revolted against his father. Young Henry had been made the titular co-King of England alongside his father in 1170 but he had no real power or income to fund his court causing a rift between father and son. In 1173 this rift resulted in a war when King Henry II gave his youngest son John Lackland (King John I) control of several castles in England prompting Henry the Young King to rebel.

The revolt itself was supported by the King of France, King Louis VII, the King of Scotland, King William the Lion, Young Henry's brothers Richard and Geoffrey, his mother Eleanor of Aquitaine, and several lesser lords of England, Normandy and Flanders. Despite this Young Henry and his allies lost, largely because they were disorganized and several important members got captured, namely King William of Scotland and Eleanor of Aquitaine. Ultimately, Young Henry and his brothers made peace with their father but died ten years later when he tried to revolt again.

So, what if Young Henry and his allies succeed in defeating King Henry II Plantagenet? Does the Angevin Empire get divided between the victors? Does Henry II get deposed? How does this effect England, the British Isles, and France?
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