As a history buff, my understanding is there were no "White" or "Black" people then, since these races hadn't been invented yet. Black British actors would have

As a history buff, my understanding is there were no "White" or "Black" people then, since these races hadn't been invented yet. Black British actors would have been fine as well, since neither race existed. Creation of these distinct races in such a cosmopolitan society as existed in many eras of the Roman Empire, where ethnic groups frequently move shockingly long distances, would require a system of racial segregation that has no historical evidence. That's not to say there was no ethnicity-based prejudice -- quite the opposite, it was an era defined by it -- but it wasn't focused on skin color. I happened to read a relevant passage on this a few weeks ago by Erik Jensen in his book Barbarians in the Greek and Roman World. In explaining how ethnicity worked in the ancient world, he gives the example of how the Greek historian Herodutus argued that the Colchians of the Black Sea were of the same "ethnicity" as Egyptians. Whether or not there was a connection is a different question, but how it was argued is more interesting, since it reveals the mentality of the time. He dismisses arguments made based on skin-tone as a red-herring since people can have all different appearances and be part of different cultures, but instead focuses on language and cultural customs (notably circumcision). If we believe his account, then if Colchians were to time-travel to modern times, most of them might be considered "Black", despite that most people living in that region today would be considered "White" -- but they were considered neither at the time, they were just "Colchians" that (according to Herodotus) had moved from Egypt