The Senatorial and Imperial Provinces
During the time of the Emperors Marcus Aurelius and Carolus, the Senate began to demand more power returned to it. In OTL the quick succession of Emperors made their demands impossible to give way to and the despotic nature of these Emperors made them unlikely to give them, anyway. After the death of Marcus Aurelius and Carolus ceasing power from Marcus's adopted son, Commodus, there was a time of deliberation which Carolus took. The Constitution of the Roman Empire, the first written constitution in the world, made by Carolus established, formally, the division between provinces to be governed by the Senate, to give them power, and those governed by the Emperor, to give the provinces defense. Imperial provinces were markedly more centralized because they tended to have few cities. The exception to this rule is found in the provinces of what were the Parthian Empire and other former Empires. These became focused on the military defense of their borders, and the daily life of the people in the cities changed little otehr than a new destination for taxes. By the time of the Peace of the Twelfth Century, all provinces around the Mediterranean Sea became Senatorial. This increased the efficiency of trade because they were almost completely unworried about invasion from any outside force. The barbarians of the North were sequestered by the army and so were the long rivaled Parthians. People of Africa were either too far to effect the civilized people or they were busy developing their cities in the model of the Mediterranean central cities. The problems showed themselves in the governments of the provinces, they would often be corrupted by the money given to the military for the defense of the country. Another factor was the seeking of recruits for the military of Rome. The Emperors would continuously fight to reduce corruption or make it work for them. Because the Senatorial Provinces began to be more numerous, thus making the reach of the Senate more universal, the Senate began to work in generalities and not in specific bills towards certain provinces.
The Provinces of Rome
On these maps, Green represents the Cimbrian Alliance which is separate from the Roman Empire. In Blue are the European Provinces, in Purple are the African Provinces and in Red are the Asian Provinces. each Province is run by a Governor who is subservient to the Emperor.
The European Provinces
The First Governor of Francia, who would later become Emperor Decius, first declared the lands to the Ural Mountains a place called 'Europa' and also described its unique destiny and control of the world. He tracked this to the development of civilization that came from Rome and from Greece and that was being carried on by the more developed countries of the Empire. Decius would focus his attention on European Affairs and the other provinces would begin to grow indifferent to the Emperor who seemed perfectly able to ignore them.
The African Provinces
The Asian Provinces