The pan-Greek parliament known as the Panhellenion…

The pan-Greek parliament known as the Panhellenion created in 126 by Hadrian is primarily a religious organization, and most of the deeds of the institution which we have relate to its own self governing.

Admission to the Panhellenion is subject to scrutiny of a city's Hellenic descent.

The Panhellenic Games are held in 137 CE at Athens as part of the ideal of Panhellenism and harking back to the Panathenaic Festival of the fifth century.

From inscriptions found, member cities include Athens, Megara, Sparta, Chalcis, Argos, Acraephiae, Epidaurus, Amphicleia, Methana, Corinth, Hypata, Demetrias, Thessalonica, Magnesia on the Maeander, Eumeneia as well the cities of Crete.

Fighting between the delegates, however, has turned the Panhellenion into an institution like the Delian League of the fifth century BCE (which to some extent it is emulating) and the Panhellenion will not survive in any real sense after Hadrian's death.