Campus Martius
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The Campus Martius was a publicly owned area of ancient Rome about 2 square kilometres in extent. In the Middle Ages, it was the most populous area of Rome. The IV rione of Rome, Campo Marzio, which covers a smaller section of the original area, bears the same name.
Model of the ancient Campus Martius, seen near the lower left of the picture, around AD 300. When the Assembly of the Centuries used to vote on the Field of Mars in the Roman Old Republic, it had been an area outside the Pomerium, the exact boundaries of which have not been preserved. By this time, however, it was a perfectly rectangular field, surrounded by buildings very much inside the city proper.
The Pantheon and the Fontana del Pantheon, a landmark of the Campus Martius since ancient Rome
Ara Pacis Augustae, the "Altar of Augustan Peace", as reassembled
View of the opposite side Tellus Panel at the left and Roma Panel at the right
Campo Marzio
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Campo Marzio is the 4th rione of Rome, Italy, identified by the initials R. IV. It belongs to the Municipio I and covers a smaller section of the area of the ancient Campus Martius. The logo of this rione is a silver crescent on a blue background.
Piazza Borghese
A plaque bearing the old name Campo Marzo, which was used up until 19th century: the plaque is still located above a side entrance of Porta del Popolo.