The Athenian military commander Tolmides concluded an alliance with Zakynthos during the First Peloponnesian War, sometime between 459 and 446 BC. In 430 BC, the Lacedaemonians made an unsuccessful attack upon Zakynthos. The Zakynthians are then enumerated among the autonomous allies of Athens in the disastrous Sicilian expedition. After the Peloponnesian War, Zakynthos seems to have passed under the supremacy of Sparta because in 374 BC, Timotheus, an Athenian commander, on his return from Kerkyra, landed some Zakynthian exiles on the island and assisted them in establishing a fortified post. These exiles must have belonged to the anti-Spartan party as the Zakynthian rulers applied for help to the Spartans who sent a fleet of 25 to the island.