 It had independence from Thasos as dues of its customs were collected in its own harbour.At one point, property of Neapolitans in Thasos was confiscated by the oligarchs related to a situation from before 463 BC when the Thasian "peraia" was detached from Thasos.Despite the defection of Thasos from the Delian league in 411 BC, Neapolis remained loyal, causing the Neapolitan oligarchs to flee to Thasos and the confiscation of their property.