CAMPUS MARTIUS, among the Romans, a field, by the side of the Tiber, where the youth exercised themselves in warlike exercises. It was so called, on account of a temple that stood on it, consecrated to the god Mars. The consuls Brutus and Collatinus made it the place for holding the comitia or assemblies of the people, and in after-times it was adorned with a great quantity of fine statues.