In Greek mythology, Euryalus (Ancient Greek Εὐρύαλος, "broad") was an Argive hero, son of Mecisteus (and Astyoche in Apollodorus; Hyginus gives Pallas and Diomede). He sailed with the Argonauts, returned as one of the Epigoni against Thebes, and fought at Troy as Diomedes' brother-in-arms, entering the Wooden Horse and losing the boxing match to Epeius at Patroclus' funeral games.
Adapted from Wikipedia, "Euryalus" · CC BY-SA 4.0
I.Family and early deeds
Euryalus belongs to the Argive house of Talaus through his father Mecisteus. Apollodorus lists him among Jason's Argonauts and among the Epigoni who took Thebes to avenge the Seven. That double career places him a generation below the first Theban war and among the heroes who later sail to Troy.
II.Trojan War
In Homer's Iliad he fights as Diomedes' companion from Argos. He is named among the Greeks who enter the Trojan Horse in later epic summarizers. At the funeral games for Patroclus he boxes against Epeius and loses (Iliad 23). Hyginus' alternate parentage (Pallas and Diomede) is a minority notice beside the Mecisteus stemma.
III.Homonyms
This atlas entry (euryalus-aeolid) is the Argive son of Mecisteus, Argonaut, Epigonos, and Trojan War companion of Diomedes. Distinct from the Phaeacian athlete Euryalus in the Odyssey; from Virgil's Nisus-and-Euryalus pair in the Aeneid; from suitors of Penelope from Dulichium and Zacynthus; from Odysseus' son by Euippe; and from other catalogue namesakes (Giant, suitor of Hippodamia, and others).