(Φρυνίσκος), an Achaean, who was engaged in the expedition of Cyrus the Younger. When the Cyreans had been deceived by the adventurer Coeratadas at Byzantium, B. C. 400, Phryniscus was one of those who advised that they should enter the service of Seuthes, the Odrysian prince, who wanted their aid for the recovery of his dominions. We find Phryniscus afterwards, together with Timasion and Cleanor, joining cordially with Xenophon in his endeavour to obtain front Seuthes the pay that was due, and so baffling the attempt of Heracleides of Maroneia to divide the Greek generals (Xen. Anab. 7.2. §§1, 2, 5. §§ 4, 10). [HERACLEIDES, No 16.]