History of the Peloponnesian War

The northward Thracians, too, beyond the Strymon were alarmed, as many as lived in a champaign country, namely, the Panaei, the Odomanti, the Droi, and the Dersaei; who are all independent.

Nay, it afforded subject of discussion even with the Greeks who were enemies of the Athenians, whether they were not led on by that people on the strength of their alliance, and might not come against them also.

Sitalces then was commanding at once Chalcidice, Bottica, and Macedonia, and was ravaging them all. But when none of the objects for which he made the expedition was being gained by him, and he found his army without provisions and suffering from the severity of the weather, he was persuaded by Seuthes the son of Spardacus, who was his nephew and next in authority to himself, to return with all speed. For Seuthes had been secretly won over by Perdiccas, who promised to give him his sister, and a sum of money with her.