Empire Romae

From SFWiki

The Empire Romae was the largest empire in the history of the world, spanning a huge region that encompassed what is now the Empire of Pompeii, Tuscan, Cisalpina, and huge parts of what would become Aquitania and the Newland Principalities. The seat of the Empire Romae was the great city of Roma, which was destroyed in the Great Rising (and with it, the Empire Romae itself).