When I make someone my vassal, their only use to me is a human shield. They take the brunt of the damage, and I finish off the rest. As long as I'm "helping" them, they don't seem to mind. Also, I rent my lands to nearby clans. Pay me 300 per turn for 5 turns, and you can have military access for 5/10.

I always keep my vassals in check. To make sure they wont rebel. Even if that means they hate me, so be it. I'll just kill them off later. Always demand money from your vassals. Money = men = power. If you have to, threaten them.

But I do have a question. If an ally/vassal declare war ON YOU, do you get a worse Dishonouring Treaties thing?