Processional frieze showing members of the Imperial household (south face) At right: dressed in a toga; but with the toga pulled over his head to show that he was a priest; was probably Agrippa; Augustus' colleague and son-in-law. - The Ara Pacis Augustae (Altar of Augustan Peace) is an altar in Rome dedicated to Pax; the Roman goddess of Peace. The monument was commissioned by the Roman Senate on July 4; 13 BC to honor the return of the Roman emperor Augustus to Rome after three years in Hispania and Gaul and consecrated on January 30; 9 BC. Originally it was located on the northern outskirts of Rome. It was reassembled in its current location; now the Museum of the Ara Pacis; in 1938.