Ægæon. [Greek .] (Greek & Roman Mythology.) A huge monster with a hundred arms and fifty heads, who, with his brothers Cottus and Gyges, conquered the Titans by hurling at them three hundred rocks at once. By some he is reckoned as a marine god living under the Ægean Sea; Virgil numbers him among the gods who stormed Olympus; and Callimachus, regarding him in the same light, places him under Mount Ætna.