The city and province names are *generally* spelled in the language that the rulers of the faction would use. That's why Alexandreia definitely remains thus, as the Greeks spelled it. If it's rebel, then it's more up in the air, and we would try to go with a more localized name for those places, but if we can't find it, we might revert to the Greek variant for some places that we have good information on in greek texts. For a faction like Pontos it's harder, as in 272 they start out using something other than Greek, but within a century Greek has become the language of choice for the court and decrees, etc. ("Greek became the official language." - B.C. McGing) We had a big argument about it for quite a while too, but eventually settled on Greek for them.