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riskywhat

Corporal
30 Badges
Sep 2, 2016
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I am playing as the Petty King of Wessex in the 769 start and have made most of Wales tributaries while I slowly add the south England to my demesne, however when I try to declare war on the Petty King of Powys, I can't. It says "must have a valid casus belli." I thought I didn't need a casus belli to declare a tributary war? Any help would be greatly appreciated!