Rebellion of 1088
With William's death, his realms were parted between his two sons (England to William Rufus, Normandy to Robert Curthose) and the Norman-French border war concluded. Factional strains between the Norman barons, faced with a double loyalty to William's two sons, created a brief civil war in which an attempt was made to force Rufus off the English throne. With the failure of the rebellion, England and Normandy were clearly divided for the first time since 1066.
Read more about this topic: List Of Wars Involving England And France