The Pan-Ionian sanctuary of Poseidon on the Asiatic promontory of Mycale was regarded as perpetuating a cult from Peloponnesian Achaea, and the league of twelve cities which maintained it, as imitated from an Achaean dodecapolis, and as claiming (absurdly, according to Herodotus i.
His fathers took a prominent part in Athenian politics, and in 479 held high command in the Greek squadron which annihilated the remnants of Xerxes' fleet at Mycale; through his mother, the niece of Cleisthenes, he was connected with the former tyrants of Sicyon and the family of the Alcmaeonidae.
After the battle of Mycale (479 B.C.), Lampsacus joined the Athenians, but, having revolted from them in 411, was reduced by force.
That struggle was not terminated by the battle of Mycale and the capture of Sestos in 479 B.C. It continued for thirty years longer, to the peace of Callias (but see Callias and Cimon).
His chief sanctuary was at Mycale, where the Panionia, the national festival of the Ionians, was held.