You can read more about cameos like these in Black Africans in Renaissance Europe By K. Lowe, p. and Early Modern Visual Culture: Representation, Race, and Empire in Renaissance England By Peter Erickson & Clark Hulse, p.
Arkesilas Cup: The Cyrenian king Arkesilas watching over the bundling of wool (Boardman) or the preparation of silphion. Artist: Arkesilas Painter (name piece). Found in Vulci, Etruria. between circa 565 and circa 560 BC.