John Wesley on Acts 17:19

The Areopagus, or hill of Mars, (dedicated to Mars, the heathen god of war,) was the place where the Athenians held their supreme court of judicature. But it does not appear he was carried thither as a criminal. The original number of its judges was twelve; but afterward it increased to three hundred. These were generally men of the greatest families in Athens, and were famed for justice and integrity.