As can be seen in the screenshots below, the Norman Conquest is being forced to end because the King of Aragon has just joined a war against France, while also being a defender in the Norman conquest, helping defend England. Oddly, I discovered that if I save while that pop up is onscreen, and then load that save, the war isn't forced to end.
Here is a save from a few days before the war was forced to an end. Be sure to put William the Bastard as a Character of Interest, so you get the pop up about the war ending.
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Here is a save from a few days before the war was forced to an end. Be sure to put William the Bastard as a Character of Interest, so you get the pop up about the war ending.
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