I was playing as a king (Austrasia), then I was overthrown. I am now Duke of Brabant. The year is 913, I started in 769.
However, I can't raise any of my demesne or liege levies. All of the buttons to raise them are grey, even though my army isn't already raised. I can still declare war on people.
Is this a bug or is there a particular reason for this behavior that the game is not specifying?