Those interested in the topic of early Greco-Roman attitudes regarding Black people may also be interested in these books:

Black Athena Revisited by Mary R. Lefkowitz

Black Athena: The Afroasiatic Roots of Classical Civilization (The Fabrication of Ancient Greece 1785-1985, Volume 1) by Martin Bernal

The Invention of Racism in Classical Antiquity by Benjamin Isaac

Black Women in Antiquity (Journal of African Civilizations ; V. 6) by Ivan Van Sertima