New liege won't make peace after successfully taking duchy title by conquest
Playing as the Count of Gent (younger son of the Duke of Flanders, and vassal to the Duke of Upper Lorraine and King of Germany, while Dad is vassal to King of France), when the Duke dies I get a claim on the Ducal throne. Being cautious, I wait until the French King is tied up in a war with the Duchy of Brittany before trying to make good on my claim. Eventually, with some help from my liege lords, I persuade big brother to see the error in Father's will and become Duke of Flanders. I am now vassal to the King of France, but still at war with him. I had to take all his demesne provinces (well, all that weren't being controlled by someone else - he was at war with the Dukes of Bourgogne and Toulouse towards the end as well) before he would accept me as Duke of Flanders. After capturing each demesne province I would propose a peace that would keep me as Duke (not force him to acknowledge me as rightful Duke) and have no money change hands, but he would always reject it until I captured the last demesne province, when I had enough warscore to demand acknowledging me as rightful Duke, and he accepted it.
Playing as the Count of Gent (younger son of the Duke of Flanders, and vassal to the Duke of Upper Lorraine and King of Germany, while Dad is vassal to King of France), when the Duke dies I get a claim on the Ducal throne. Being cautious, I wait until the French King is tied up in a war with the Duchy of Brittany before trying to make good on my claim. Eventually, with some help from my liege lords, I persuade big brother to see the error in Father's will and become Duke of Flanders. I am now vassal to the King of France, but still at war with him. I had to take all his demesne provinces (well, all that weren't being controlled by someone else - he was at war with the Dukes of Bourgogne and Toulouse towards the end as well) before he would accept me as Duke of Flanders. After capturing each demesne province I would propose a peace that would keep me as Duke (not force him to acknowledge me as rightful Duke) and have no money change hands, but he would always reject it until I captured the last demesne province, when I had enough warscore to demand acknowledging me as rightful Duke, and he accepted it.
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