Not sure on bribes, but I'm pretty sure the AI only brings in war allies to a war they already are involved. I seriously doubt a third party did that, but then again, I don't play with the "crazies" much.
@Blub: KK could have been bribed (not can). Just pointing out the english you requested, I'm not agreeing he could have been bribed.
Friendly: Remember, If they were only Pleased on the turn they made the decision to make a war machine and send it at you, it's too late to go friendly and stop them. I don't know how long you'd have to be friendly w/Ragnar to be 100% safe.
@Blub: KK could have been bribed (not can). Just pointing out the english you requested, I'm not agreeing he could have been bribed.
Friendly: Remember, If they were only Pleased on the turn they made the decision to make a war machine and send it at you, it's too late to go friendly and stop them. I don't know how long you'd have to be friendly w/Ragnar to be 100% safe.