Decelea, modern Dekeleia or Dekelia, Deceleia or Decelia, previous name Tatoi was a decisive source of supplies for Athens. With advise from Alcibiades, former Athenian General who was wanted on charges of religious crimes, Spartans fortified Decelea in the Peloponnesian War preventing Athens from getting supplied by land. This decimated Athens, who was already getting badly beat in the Sicilian Expedition.