One of the Aloadae, the twin giants who single-handedly tried to storm the heavens by piling three mountains one upon the other. Ephialtes wooed Hera while his brother Otus sued for the hand of Artemis, but this led to their destruction in the island of Naxos. Artemis appeared to them in the form of a stag, and ran between the two brothers, who, both aiming at the animal at the same time, shot each other dead.
- Pseudo-Apollodorus. The Library i, 7.4.