Rome would probably reinforce the crusade company and glower at them a lot, and the mountain kingdom might have to ally with unsavory sorts such as Team Evil, of which ol' Thanquol will definitely be a secret member.

The primary target of Rome at the moment is the Rift, and expanding into the new continent. Britain on the other hand might become adversarial quickly, I'll ask Arturia's player about it because it will depend on her.