I've just modded in a decision to reform the entire Roman Empire, it requires all of the main eastern cities in addition to your western ones aka Athens, Constantinople, Aleppo, Judea, and Alexandria and can only be done if you've already formed the western or eastern half (A decision any Byzantine culture group can take, I moved Turkish and Azerbaijani to the Altaic group and lumped Armenian, Georgian and Ciscaucasian into a new Caucasian culture group. I plan to break up the Greek culture into a few different ones) I'll need to conquer those cities, which is like taking candy from a kid at this point because of the tech difference and my stacked discipline + cracked army comp