I don't ever recall reading that Roman Emperors regarded their particular race as superior to other races. I have read that the Emperor himself felt himself superior to others but not his particular race. Do you have any references for that?
Americans came from all different parts of Europe, yet they could always be spotted by the way they moved, their facial expressions, etc. The same with the British, but that was years ago, I'm not too sure it's that easy today. Also there are different expressions in the eyes between different cultures.
I think we carry an instinct to be suspicious of people different from ourselves. The trait had survival value during most of our history when resources were scarce. Europeans, for example are all various shades of white and yet they have viciously murdered and enslaved each other as frequently as any other race.
The Romans also called unconquered people such as German tribes barbarians because they thought as Americans did with Native Americans that they were not civilized. It was a way of dehumanizing outsiders to make it easier to exploit them.
Say What Moi629!!? Our daughter is strawberry blond, and our 15 month grand daughter is a combination of blond and redhead with my blue eyes. My whiskers are blond, two shades of red and brown. Get rid of Gingers? We need more of them. Thanks for the laugh. I loved your comment.
I cannot be sure: Jews, overall the European ones, are not of a different color. I cannot distinct an "Italian Jew" from an "Italian something else", anyway racism has affected the history of European Jews in a deep and heavy way. This to say that I suspect that even when there are no "races" around, extremists would find a way to invent racial differentiations ...
Yeah the Romans themselves believed themselves to be superior to others but as far as a particular race of Emperor believing HIS "race" to be superior I don't recall. For example I dont ever recall reading that the black Emperor Septimius Severus believed Africans to be superior to other Romans.
Racists would find something else to hate over, the left would find something else to scream "won't someone please think of the children!?" at.