This mod includes 3 campaigns: 355 AD - Julianus is Caesar in Gaul charged with defending it against the Franks and Germans, while Constantius II takes on the Quadi and then the Sassanids. There is suspicion and mistrust between them. There will be civil war. 361 AD - Julianus is now Emperor and getting ready to invade the Sassanid Empire. But all is not in the Empire. The Franks and Germans may have been defeated, but they are not subdued and religious division is growing, plus rebellion from those within the Empire. 365 AD - Julianus now lies dead in the sands of the East. Jovianus has come and gone and now the Empire sees it ruled by two brothers, Valentinian I in the West and Valens in the East. But there is a challenge to the throne from Procopius, a cousin of the dead Julianus.
One of the best or simply the best mod for RTW. Surely the best mod for Barbarian Invasion addon. It is only rivaled by Roma Surrecta with its elaborated background, historically accurate setup, immersive and atmospheric campaigns.
And you CAN play as whole late Roman Empire in the campaign as Julianus :)
1. Different campaigns for different times and fractions.
2. Detailed ancillaries.
3. Many regional units.
4. Various economy options.