Of all the people described by Herodotus, the Scythians seem the most “barbaric,” in both senses of that word (according to 46, though, they are quite “clever”). The Scythians are to the Persians what the Picts are to the Romans, or the Mongols to the Chinese: semi-nomadic invaders from the north, who cause nothing but trouble. Unfortunately their barbarian nature makes them hard to conquer, or so Darius discovers.
The Scythians are not the only people detailed in Book 4. Along with Scythian neighbors (such as the Budini, Issedones, and Hyperboreans), the reader is also treated to some details about Libya – in Herodotus, a general name for Africa, or at least North Africa. Herodotus explicitly compares Scythia with Libya in 29-30, through the lens of climate: Scythia is cold, and Libya is hot, and this affects the growth of animal horns: in Libya they grow quickly, and in Scythia hardly at all (also 129: “there is not in the whole country of Scythia an ass or a mule at all, because of the cold”; see also Herodotus’s remarks on the thickness of Persian and Egyptian skulls in 3:12). At this point, Herodotus invokes “the testimony of Homer,” citing a line from the Odyssey about horn-growing Libyan sheep as “correct” evidence for his theory. One certainly gets the sense here that Herodotus is aware of Homer’s prestige, but that he is writing a different sort of work; he cites the poet, but minimizes his overall importance. (Interestingly, Herodotus does not cite Homer when discussing the Libyan Lotus-Eaters in 177, even though they appear in book nine of the Odyssey.)
In 151, the Oracle tells the Thereans to colonize Libya, and they found Cyrene, to the west of the Nile, under Battus. After a rocky start the Oracle recommends a Mantinean commissioner for reform (in 161), to help the Cyreneans organize themselves as a proper polis. They have an influence on their Libyan neighbors, like the Asbystae, who “more than any others of the Libyans, are drivers of four-horse teams to the chariot, and in most of their customs they imitate the Cyrenaeans” (170). Otherwise, Libyans are strange: among the Auschisae it is the custom for “each man to have many wives, but their enjoyment of them is in common” (172). The Garamantes “avoid everyone and the company of anyone. They have no warlike arms at all, nor do they know how to defend themselves” (174). The Auseans “enjoy their women in common. They do not live in couples at all but fuck in the mass, like cattle” (180).
The successful Greek colonization of Cyrene contrasts with the unsuccessful Persian attempt against the Scythians. Herodotus reveals his bias in this book – and suggests that he is better than Homer, or at least a worthy successor.