(Σύρυος). a kinlg> of the Triballians, who, as soon as he was aware of the intention of Alexander the Great to invade his territory. in B. C. 335, sent all the women and children of his nation to an island of the Danube, called Peuce, and afterwards, on the nearer approach of the Macedonians, took refuge there himself, with his personal followers. Alexander, having made an unsuccessful attempt to effect a landing on the island, crossed the river and attacked the Getae, whom he defeated; and on his return Syrmus sent ambassadors to sue for peace, which was granted. Plutarch says that Syrmus was conquered by Alexander in a great battle, a statement which would contradict the account of Arrian, as given above, if we were to understand it of a personal defeat (Arr. Anab. 1.2-4; Plut. Alex. 11 ; Strab. vii. p.301).