Alcamar said:4) The only things worrying me are a) that i am now sharing a border with Persia, and I don't want a war with them yet. And b) I don't trust the presence of all these Teutonic warriors strawling around some of my northern cities.
Are you ever in luck . . . in both games I've played, the Goths have few cities and very close cultural borders. If this is the case in your game, station several legions just outside the borders of each city, and then declare war and rush in. If you capture all their cities, those hordes will disappear before they can threaten your cities, and you'll have a secure northern border. If you don't think you'll be able to take all the cities in fewer turns than it will take them to attack your nothern cities, you might want to consider pillaging some no-man's-land roads between your cities and their forces.