@Alalae There was no need for a divorce. He could tell everyone that Diana was ill and send her as far away as possible to "get well".
Comment by K321 M. on Alalae
2 Replies
@K321 M. I like this solution. Let her live like a dead rat 
@K321 M. Also because of her "illness", she might not be able to bear a healthy heir, so he'd have to demote her to second princess/wife and take a new crown princess. The temple's weak now, and if the nobles had a fit about two wives, it's a good time to assert the authority of the throne.