In Greek mythology, Eurybates (Ancient Greek Εὐρυβάτης) is the name of the herald — or heralds — of the Greek host at Troy. Homer sends Eurybates with Talthybius to fetch Briseis from Achilles, and also names an Ithacan Eurybates as Odysseus' trusted squire, "round-shouldered, dark-skinned, and curly-haired," whom Odysseus valued above his other companions for honesty.
Adapted from Wikipedia, "Eurybates" · CC BY-SA 4.0
I.Herald of the Achaeans
In Iliad 1, Agamemnon sends the heralds Talthybius and Eurybates to Achilles' hut to take Briseis. Whether this Eurybates is the same man as Odysseus' Ithacan herald in Iliad 2 and the Odyssey is debated; many readers treat them as one figure in Homeric usage, while some scholars keep an Agamemnon-camp herald distinct from Odysseus' attendant.
II.Odysseus' companion
In the Odyssey (19.246–249) Odysseus, still disguised, describes his herald Eurybates of Ithaca to Penelope: round-shouldered, dark-skinned, curly-haired — and dearer to him than any other companion for his steadfast character. Earlier epic tradition also has this attendant gather Odysseus' cloak when Athena sets the hero running to still the assembly.
III.Atlas note
This atlas entry (eurybates) covers the Homeric herald(s) under one node, matching the character's dual role as Agamemnon's messenger and Odysseus' squire. He is distinct from Talthybius (talthybius), the other principal Achaean herald.