Thayer's Greek Lexicon

 Areopagus = "martial peak"
1. a rocky height in the city of Athens, opposite the western end
of the Acropolis toward the west.

This hill belonged to (Ares) Mars and was called Mar's Hill; so
called, because, as the story went, Mars, having slain Halirrhothius,
son of Neptune, for the attempted violation of his daughter Alicippe,
was tried for the murder here before twelve gods as judges. This
place was the location where the judges convened who, by appointment
of Solon, had jurisdiction of capital offences, (as wilful murder,
arson, poisoning, malicious wounding, and breach of established
religious usages). The court itself was called Areopagus from the
place where it sat, also "Areum judicium" an "curia". To that hill
the apostle Paul was not led to defend himself before judges, but
that he might set forth his opinions on divine subjects to a greater
multitude of people, flocking together there and eager to hear
something new.