Balius and Xanthus

Sources present variant genealogies. The principal tradition names the harpy Podarge and the West Wind Zephyrus as the parents of Balius and Xanthus, making them offspring of wind and a divine/monstrous mother. Alternative accounts attribute parentage to Poseidon (and in fragmentary variants pair Xanthus with other divine-born horses such as Cyllarus) or present them as divine gifts from Poseidon to Peleus at his marriage to Thetis. Peleus then passes the horses to his son Achilles; the horses thereafter appear yoked to Achilles' chariot in the Trojan War narratives.

Descriptions in surviving sources are not highly detailed beyond heroic and descriptive epithets. Xanthus' name means "blonde" and is presented as indicative of coloration; Balios (Balios/Balius) has an uncertain etymology, sometimes rendered as possibly "dappled." Homeric and later summaries call them "Podarge's famous colts," "far-famed," or "bright" steeds suited to draw a hero's chariot, emphasizing nobility, swiftness, and an arresting, heroic appearance rather than precise markings or tack.

Traditionally described as exceptional in speed and endurance, able to draw Achilles' chariot in battle and to outrun or outpace mortal horses. Many sources characterize them as immortal or of divine origin in certain traditions, though genealogies vary. They display attachment and responsiveness to their masters and attendants; Homeric material relates that they stood motionless and wept at Patroclus' death. In Iliad Book 19 Hera grants Xanthus the power of human speech so that the horse can declare that Apollo struck Patroclus and prophesy that Achilles will soon be killed by "a god and a mortal;" immediately after the utterance the Erinyes strike Xanthus mute. Variant fragmentary traditions associate Xanthus with other episodes or owners (e.g., the Dioscuri) but these are uncertain in the extant summaries.