you got fucking kings, Torygg, Helseth, living gods of the Tribunal.... under an "Emperor"? who puts some garrisons around but does.... what exactly?
theres an "East Empire Trading Company"? whats that do?
it kinda seems like a holy roman empire, kinda seems like a regular roman empire. they've got knights, dukes, but a Legion...
yes i know the answer is technically "these jackoffs just made it up as they went" and don't care a lick about political theory but this is exactly the kind of excercise that makes fun speculative historiography
yeah the lore is consistent on the Empire being antislavery but its a mismatch when that's paired with real-world roman iconography-aesthetics. and empire is not antithetical to chattel slavery, they can figure out other ways of exploitation
im not certain i can endorse your peripheries though, like argonians and khajiit got enslaved by dunmer but that was illegal so its difficult to fold into the continent-wide economy? not that the word of law renders reality impotent but we dont know the extent of slavery in other province at that time. be very easy for Elswyr or Black Marsh to be perifery if imperials/other empire aligned people were running plantations there but we dont know if they actually were