The Areopagus or Areios Pagos is the 'Rock of Ares', north-west of the Acropolis, which in classical times functioned as the high Court of Appeal for criminal and civil cases in Athens. Ares was supposed to have been tried here by the gods for the murder of Poseidon's son Alirrothios (a typical example of an aetiological myth).
The origin of its name is not clear. In Greek pagos means big piece of rock. Areios could have come from Ares or from the Erinyes, as on its foot was erected a temple dedicated to the Erinyes where murderers used to find shelter so as not to face the consequences of their actions. Later, the Romans referred to the rocky hill as "Mars Hill," after Mars, the Roman God of War. Near the Areopagus was also constructed the basilica of Dionysius Areopagites.
In pre-classical times (before the 5th century BC), the Areopagus was the council of elders of the city, similar to the Roman Senate. Like the Senate, its membership was restricted to those who had held high public office, in this case that of Archon. In 594 BC, the Areopagus agreed to hand over its functions to Solon for reform. He instituted democratic reforms, reconstituted its membership and returned control to the organization.
In 462 BC, Ephialtes put through reforms which deprived the Areopagus of almost all its functions except that of a murder tribunal in favor of Heliaia.
In The Eumenides of Aeschylus (458 BC), the Areopagus is the site of the trial of Orestes for killing his mother (Clytemnestra) and her lover (Aegisthus).
Phryne, the hetaera from 4th century BC Greece and famed for her beauty, appeared before the Areopagus accused of profaning the Eleusinian mysteries. Legend has it that she let her cloak drop, so impressing the judges with her approximately divine form that she was summarily acquitted.
In an unusual development, the Areopagus acquired a new function in the 4th century BC, investigating corruption, although conviction powers remained with the Ecclesia.
The term "Areopagus" also refers to the judicial body of aristocratic origin that subsequently formed the higher court of modern Greece.