(Σαλύνθιος), a king of the Agraeans, gave a hospitable reception to the Peloponnesians, who, after the battle of Olpae (B. C. 426), had abandoned their Ambraciot allies and secured their own safety by a secret agreement with Demosthenes, the Athenian general. In B. C. 424, Demosthenes invaded the territory of Salynthius, and reduced him to subjection. (Thuc. 3.111, 4.77.)