Euryalus

Euryalus refers to two different people.

In the Aeneid, Euryalus and Nisus were considered ideal friends. He died during a raid on the Rutulians. (Virgil V, 294, 334; IX 179, 199, 226, 431)
In Greek mythology, Euryalus, son of Mecisteus, is one of the Epigoni and Argonaut who also participated in the Trojan War, where he was listed as the leader of Argos. He was brother-in-arms of Diomedes, and one of the Greeks to enter the Trojan Horse.