Hi,
Protectorates can only really be allowed by the AI if they are down to one measly little province. The best option in this situation is to first go and ask for a protectorate with a decent diplomat. If they refuse then attack their richest and largest provinces and exterminate them. Once they are down to this one province ask them again. They should be more that willing to accept a protectorate off of you now. Just incase they refuse keep one army within a one turn marching distance so you can besige the enemy town if they say no. In that case you neither lose the senate mission nor do you win it. This means that no favour is aquired off the senate and non is lost. Good luck with your protectorate and cheers!
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