997-1015 CE (Superpowers)

''After an anti-Marian faction took control of the Senate, the empire was split into a mess of pieces as different generals positioned themselves for civil war. With Eastern Africa and most of the Trans-Danubian provinces, the former Caesar Marius and his family had the advantage of numbers on land but lacked the hold over Rome itself and a number of wealthy provinces, although they held Egypt and its grain. Meanwhile, the rest of the empire was under the control of the Senate and its Committee, giving them greater resources at sea and the legitimacy of control over Italy. Neither side had clear control over the outcome of the war.''

Summary
For the time being, a timeline of events in the civil war suffices to outline its procession and explain its outcome.