Overview of the Post-Roman World in 310
Part 2, The Italian Principate
Italy is a sub-roman state centered around Rome itself. Since 308, Andronicus of the House of ictorianus has ruled Italy as Caesar. The Italians still consider themselves the true Roman Empire, though most modern historians would date Andronicus's coming to power as the empire's official end. Italy is usually divded into four parts - Cisalpine Gaul in the north, Latium in the center, Magna Graecia in the south, and the islands of Sicilia, Sardinia, and Corsica.
Italy is, of course, ethnically and linguistically Latin. There are a few Hellenes in Magna Graecia, but they have largely disappeared by this point. A branch of the Alammani settled in Cisalpine Gaul several decades ago, and as a result the Italians there tend to be taller and fairer and speak with a distinct accent.
Religously, Italy has no single dominating religion, though Andronicus, like his brother, is a devout Sol Invictine. Many Italians are Sol Invictines, Christians, Mithraists, or follow the old Capitolinist faith, with a few Hellenistics in the south and Wotanists in the north.
Andronicus has begun enacting the same reforms that are in place in Gaul, socially stratifying the Italians. Like Gaul, Italy has abandoned the legionnaire in favor of the comitanses, and the professional army in favor of mercenary-supplemented levies.
After the empire fell apart, Italy was dependent on grain shipments from Africa and Egypt. When Africa broke away, these shipments became smaller, and when Egypt rose up in revolt, the shipments stopped entirely, leading to massive uprisings, sparking the anarchial period known as the Interregnum.
It should be noted that, due to their extreme expense, gladiatorial games are only held in the Flavian Amphitheatre when a new Imperator is hailed in Rome, meaning there hasn't been one in two years. As a result, gladiator' skills are atrophying, and the next one will most likely be amateurish by comparison.
Italy is a vassal state to Gaul, though this isn't something someone says to an Italian's face. Andronicus has, in fact, considered moving his residence to a northern city like Mediolanum.
Part 3, The African Empire
The African Empire is the youngest of the sub-Roman states. Ruled by the House of Domitius, Africa is ruled from Carthago. Africa is a largely Punic and Berber nation, with a Latin ruling caste. No single religion dominates, though the Christians and Manicheans are both prominant.
Socially, Africa is divided by race. The Latins, largely Emperor Domitius Alexander and his family and hangers-on from Italy and Sicilia, are on top. The Punics fill all the government and mercantile positions. And the Berbers make up the peasant class.
Economically, Africa trades with all of the other mediterranean states, and with the Sub-Saharan region kbown as Awkar. The Africans also raid their neighbors with privateers based in Malta.
Because of the enviroment, the heavily armored legionnaire proved to be shortlived. To deal with their main enemies, the Berbers of the Sahara, the Africans employ lightly armed horsemen, camelry, archers, and spearmen. The Moroccan Elephant has recently gone extinct, so the Africans don't use elephant riders like their Carthiginian predecessors did.
Although I have used "Berber" to describe the North Africans, this name is technically anachronistic. Those living within Africa's borders should more accurately be called "Numidian", those living outside are "Mazices".