 Fehling states that Herodotus never traveled up the Nile River, and that almost everything he says about Egypt and Aethiopia is doubtful.Supporters of the Black theory saw the Aethiopians and Egyptians as racially and culturally similar, while others felt that the ancient Egyptians and Aethiopians were two ethnically distinct groups.This is one of the most popular and controversial arguments for this theory.