The Ara Pacis Augustae or Altar of the Augustan Peace in Rome was built to celebrate the return of Augustus in 13 BCE from his campaigns in Spain and Gaul. The marble structure, which once stood on the Campus Martius, is a masterpiece of Roman sculpture and, in particular, of portraiture. Senators, officials and the Imperial family are depicted on the wall reliefs of the monument in an animated procession, perhaps, the very procession which consecrated the altar site on 4th July 13 BCE or the celebratory procession to welcome the emperor's return.
This is a companion discussion topic for the original content at https://www.worldhistory.org/article/618/ara-pacis-augustae/.