(Σοφαίνετος), a native of Stymphalus in Arcadia, was a commander of mercenaries in the service of Cyrus the Younger, whom he joined in his expedition against Artaxerxes, in B. C. 401, with 1000 heavy-armed men. In the following year, after the treacherous apprehension of Clearchus and the other principal generals of the Cyreans, Sophaenetus and Cleanor were deputed to meet Ariaeus, and receive his explanation of the transaction. When the main body of the Greeks, after their arrival on the frontier of the western Armenia, marched to dislodge Teribazus from the defile where he meant to intercept them, Sophaenetus remained behind in command of the troops that were left to guard the camp. At Trapezus, Philesius and Sophaenetus, being the oldest of the generals, were placed in command of the ships which were to sail to Cerasus with the men above forty, and the women and children, while the rest of the army proceeded thither by land. Some deficiency being afterwards detected in the cargoes of these ships, an investigation took place at Cotyora, and Philesius, Xanthicles, and Sophaenetus were fined, -- the two former for peculation or carelessness in the custody of the goods, and the third for his negligent supervision of them. We find Sophaenetus mentioned again, in the account of the engagement of the Cyreans with the Bithynians and the troops of Pharnabazus, as giving his opinion against the attempt to cross a deep glen which lay on the line of march. (Xen. Anab. 1.1.11, 2. §§ 3, 9, 2.5.37, 4.4.19, 5.3.1, 8.1, 6.5.13.)