Ara Pacis

Significance

The altar reflects the Augustan vision of Roman civil religion. The lower register of its frieze depicts agricultural imagery meant to evoke prosperity, abundance, and the renewed stability associated with the Pax Romana. As a whole, the monument functions both as a site of civic ritual and as a propaganda statement supporting Augustus's regime. The inclusion of the imperial household in the processional friezes further supports Augustus's efforts to legitimize dynastic succession and reconcile monarchical power with Roman cultural expectations.

Structure

The Ara Pacis Augustae, or Altar of Augustan Peace, consists of a central sacrificial altar enclosed by precinct walls made of Luna marble. The monument sits on a podium and is entered from the west, where a small staircase would have led visitors into the open-air ritual space. The design combines a traditional Roman altar layout with carved marble panels that reflect Augustan religious and political themes.

The central altar preserves fragments of scenes illustrating the lex arae, or the rules for sacrifices performed there. The surviving reliefs show attendants leading animals for sacrifice, carved in a style common in the late Republic as seen in works like the Altar of Domitius Ahenobarbus. These scenes focus on depicting the actual ritual rather than decorative detail, highlighting the altar’s practical role within Augustan religious ceremonies.

The interior walls of the precinct feature a frieze of bucrania (ox skulls) alternating with garlands of fruit and flowers. These motifs were commonly used in Roman sacred art and often referred to ceremonial offerings and ritual purity. The lower part of the wall is carved to imitate wooden planks, connecting the monument to earlier altars traditionally placed at the boundaries of Rome’s pomerium and reinforcing its link to Rome’s ancestral ritual practices.

The exterior decoration of the Ara Pacis Augustae is divided into two main zones: the lower register, which contains the vegetal frieze, and the upper register, which features the processional and mythological panels. Together, these elements communicate both the natural prosperity associated with the Pax Augusta and the human and divine figures who supported Augustus’s political authority. Early interpretations emphasized fertility and cosmic symbolism, while more recent scholarship has examined how these images relate to Augustan ritual practice and ideological messaging.

Lower register …

Excavation and conservation

Fragmentary sculptures from the Ara Pacis were first rediscovered in 1568, when portions of the frieze were uncovered beneath the Palazzo Peretti in Lucina (also known as Palazzo Fano-Almagià), near the basilica San Lorenzo in Lucina and the modern Via del Corso. Many of these early finds were eventually moved to collections such as the Villa Medici, the Vatican, the Uffizi and the Louvre.

Further fragments were found in 1859 during excavations beneath the Teatro Olimpia, another property belonging to the Peretti family. Scholars recognized that these newly uncovered pieces belonged to the same monument as the earlier finds.

A major turning point happened in 1903, when, after Friedrich von Duhn's identification of the reliefs as belonging to the Ara Pacis (1879–81), the Ministry of Public Education received a formal request to continue the excavations. Progress was made possible by the generosity of Edoardo Almagià, who gave permission for the exploration and funded the work. However, the excavations soon encountered structural risks to the Teatro Olimpia. After recovering 53 fragments, approximately half of the surviving material, the excavation was called to a halt for safety reasons.

Urban redevelopment plans also influenced the site's history. In 1909, the Italian government approved the demolition of several buildings surrounding the Mausoleum of Augustus to bring the mausoleum back to view. After the First World War, in 1918, Oreste Mattirolo, the President of the Piedmontese Society of Archaeology and Fine Arts, proposed assembling all known fragments to reconstruct the altar.

Demolition of buildings around the mausoleum officially began in 1932, part of broader transformations occurring throughout Rome at the time. In February 1937, the Italian Cabinet ordered the excavation and reconstruction of the Ara Pacis for the 2000th anniversary of the birth of Augustus. Engineers employed innovative techniques, including freezing approximately seventy cubic meters of soil under what was by then the Cinema Nuovo Olimpia, to safely extract the remaining fragments. …