(Ἕλιξος), of Megara, with a portion of the Lacedaemonian squadron, which, on its way to the Hellespont, under Clearchus, was dispersed by a storm, made his way to Byzantium, and received it into the Peloponnesian confederacy, in the 21st year of the war, B. C. 411. (Thuc. 8.80.) Here he appears to have remained with a contingent from Megara. We find him at the end of the year B. C. 408 left with Coeratados, the Boeotian, in command of the place, then besieged by the Athenians, while Clearchus went out to seek reinforcements. The Byzantines, whose lives were being sacrificed to leave sufficient food for the garrison, took the opportunity of communicating with the besiegers; and by means of a stratagem, succeeded in admitting them. Helixus and his colleague were obliged to surrender as prisoners of war. (Xen. Hell. 1.3. §§ 17-22; comp. Diod. 13.66, 67.)