Amphictyonies

thumb|250px|Poseidon's head (identified by an inscription), detail from a scene representing Athena and [[Poseidon. Side B from an Attic black-figure neck-amphora, c. 550–530 BC. From Vulci. Signed by the Amasis Painter.]] The Panionium (Ancient Greek: Πανιώνιον, Paniōnion) was an Ionian sanctuary dedicated to Poseidon Helikonios and the meeting place of the Ionian League. It was on the peninsula of Mt. Mycale, about south of Smyrna—now İzmir, in Turkey. Herodotus describes it as follows:The Panionion is a sacred ground in Mykale, facing north; it was set apart for Poseidon of Helicon by the j