Double monarchy was something used way back when, I had used it a lot in Battlefield days. Back when monarchs had bonuses too. If someone was getting waved, switch them to king real quick and get a bounce. Nowadays the stewards can do everything, really don't need double monarchy anymore. For those curious, you split the votes so that the king has the tie breaking vote. When they go to bed they switch to the other guy, and when he comes back he votes himself again. Monarch can change picture, kingdom name and can see hostile meter. Those are the only advantages he has over a steward and thanks to munkbot you can have a command for meter so really only two advantages over a steward. Why the death of dual monarchy, due to the lack of need and relevance in today's Utopia.