Ancient Rome had African Emperors one of which ruled Britain.

Interestingly, at least ten Africans became Emperors of Rome. They are as the following: Macrinu, Firmus, Emilianus, Septimius Serverus, Pescennius Niger, Aquilus Niger, Brutidius Niger, Q. Caecilus Niger, Novius Niger, and Trebius Niger who was a proconsul in Spain.

Africans in ancient Rome before the philosophical structure of color prejudice and racism were treated the same as any other captives.

The ancient Greeks and Romans did not display any hardcore race prejudice. The point is, not all Africans in Rome were slaves or servants. On the contrary, some were writers, generals, philosophers, and emperors. Moreover, a number of African slaves in Rome became prominent citizens and contributed to Roman culture. The African in the Roman Empire worked, lived without fear of racial animosity, entertained, and in many respects worshiped the same gods at the same place of worship together with other slaves, servants, and freedmen.

( African Roman General Septimus Severus conquered Rome in 93 AD & became Emperor of Rome and ruled Britain. "Septimius Severus: The African Emperor (Roman Imperial Biographies) 2nd Edition" )