For 10 points, a procession of the imperial family preparing to perform a sacrifice appears on the south wall of what religious monument on the Campus Martius, intended to promote the order brought by Augustus's reign?
Karl Galinsky argued for the identification of one figure on this structure by comparison with the iconography of the Zoilos heroon, that Bernard Andreae said may be from the same workshop. On the autumn equinox, the shadow of a 30m Egyptian obelisk-cum-gnomon fell directly into a doorway on this monument, commemorating the birth of its dedicator. The depiction of a cow and a sheep under the throne of a goddess on this monument may have caused Prudentius to mistake them as appropriate sacrifices for the imperial cult; two goddesses ride a swan and a dragon and flank the throne of that goddess, in whose lap are fruit and two infants and whose identity is much disputed. In addition to the Tellus panel, another disputed scene on this monument depicts an old man, Numa or Aeneas, about to sacrifice pigs. For 10 points, a procession of the imperial family preparing to perform a sacrifice appears on the south wall of what religious monument on the Campus Martius, intended to promote the order brought by Augustus's reign? 
Karl Galinsky argued for the identification of one figure on this structure by comparison with the iconography of the Zoilos heroon, that Bernard Andreae said may be from the same workshop.
Ara Pacis Augustae [or Altar of Augustan Peace or Peace Altar of Augustus] 