
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
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 joint will of the Ionians. Mykale is a western promontory of the mainland opposite Samos; the Ionians used to assemble there from their cities and keep the festival to which they gave the name of Panionia.
The sanctuary was under the control of the Ionian city of Priene, one of the twelve cities comprising the Ionian League. Priene was about away, on the opposite side of Mt. Mycale. The Prienians managed the sanctuary and presided at the sacrifices and sacred rites.
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