(Ἰσχαγόρας), commanded the reinforcements sent by Sparta in the ninth year of the Peloponnesian war, B. C. 423, to join Brasidas in Chalcidice. Perdiccas, as the price of his new treaty with Athens, prevented, by means of his influence in Thessaly, the passage of the troops. Ischagoras himself, with some others, made their way to Brasidas, but how long he staid is doubtful; in B. C. 421 we find him sent again from Sparta to the same district, to urge Clearidas to give up Amphipolis, according to the treaty, into the hands of the Athenians. (Thuc. 4.132, 5.21.)