Alright. It's been established that a region has to border a duchy to join it. I understand that. It's how things currently are.
My question is this:
If a duchy loses all its regions (the Duke wasn't a lord), how does it get regions without being named a lord? As a region automatically goes to a duchy that borders it, how would a landless duke be granted a lordship?
Could a landless Duke go to a territory and the lord there pledge to him, switching duchies that way for those that lack regions?