Besides that, the whole civ seems a bit uncreative and more or less a just a more castle age oriented version of the Slavs. Both have a passive collecting eco bonus. Both have a discount in the siege department. Both have a heavy armored cav UU. Both have a focus on infantry and capeable cavalry. Both have an absolutely disgusting archery range and no bracer. Both have no gunpowder. In the end, the infantry bonus with the armor upgrade, the eco bonus and the fact, that a single centurion is enough for the aura bonus, will result in a very strong castle age. In Imperial, the lack of two man saw will mitigate roman eco and Salvs will be stronger with Druzhina, SO and better trash units. But overall, I just can´t see the great difference between the two civs.