During the Second Peloponnesian War, a Spartan expedition led by Dercylidas arrived at Abydos in early May 411 BC and successfully convinced the city to defect from the Delian League and fight against Athens, at which time he was made harmost (commander/governor) of Abydos. A Spartan fleet was defeated by Athens at Abydos in the autumn of 411 BC. Abydos was attacked by the Athenians in the winter of 409/408 BC, but was repelled by a Persian force led by Pharnabazus, satrap (governor) of Hellespontine Phrygia. Dercylidas held the office of harmost of Abydos until at least . According to Aristotle, Abydos had an oligarchic constitution at this time. At the beginning of the Corinthian War in 394 BC, Agesilaus II, King of Sparta, passed through Abydos into Thrace. Abydos remained an ally of Sparta throughout the war and Dercylidas served as harmost of the city from 394 until he was replaced by Anaxibius in ; the latter was killed in an ambush near Abydos by the Athenian general Iphicrates in . At the conclusion of the Corinthian War, under the terms of the Peace of Antalcidas in 387 BC, Abydos was annexed to the Persian Empire. Within the Persian Empire, Abydos was administered as part of the satrapy of Hellespontine Phrygia, and was ruled by the tyrant Philiscus in 368. In , the city came under the control of the tyrant Iphiades.