The Delian amphictyony probably reached the height of its splendour early in the 7th century B.C. The Hymn to the Delian Apollo, composed about that time, celebrates the gathering of the Ionians with their wives and children at the shrine of their god on the island of Delos, to worship him with music, dancing and gymnastic contests (vv.
The later misfortunes of the Ionians caused a decline of the festival.
Thus, whereas the Ionians, confounding the unity and the plurality of the universe, had neglected plurality, and the Pythagoreans, contenting themselves with the reduction of the variety of nature to a duality or a series of dualities, had neglected unity, Parmenides, taking a hint from Xenophanes, made the antagonistic doctrines supply one another's deficiencies; for, as Xenophanes in his theological system had recognized at once the unity of God and the plurality of things, so Parmenides in his system of nature recognized at once the rational unity of the Ent and the phenomenal plurality of the Nonent.
Of the Black Sea; Javan is the Ionians, used loosely for the seafaring peoples of the West, including Tarshish (Tartessus in Spain), Kittim (Cyprus), Rodanim 5 (Rhodes).
Thus, at Athens,Apollo Patroos was known as the protector of the Ionians, and the Spartans referred the institutions of Lycurgus to the Delphic oracle.