In his History of the Peloponnesian War (V, 11, 1), Thucydides recounts events that occurred in Amphipolis, involving Brasidas and Hagnon, the Athenian oikist. Extensive historical studies have dealt with this subject but a fresh approach involving the history of religion may cast new light on it. Hagnon’s expulsion from the city has so far been explained with political arguments but these are not the only ones to be taken into account : social, psychological, imaginary and religious factors may allow us to qualify the context in which Hagnon, who was granted the promise of a cult during his life as a city founder, was deprived of it, in a logical but still complex process. The events of – 422 in Amphipolis deserve to be examined from the perspective of cultic dynamics, which were particularly active in the last three decades of the fifth century B.C.