The Ara Pacis was not built by Augustus. The Senate voted it on 4 July 13 BC, while he was still on his way home from Spain and Gaul, and the altar was consecrated three and a half years later, on 30 January 9 BC. Augustus recorded the vote himself in his Res Gestae, and that distinction matters: the monument is the Senate's compliment to a returning ruler, not a ruler's monument to himself.
It stood on the Campus Martius, west of the Via Flaminia, in the flat river plain where Rome held its public ceremonies — not on a hill, and not in the centre of the ancient city. Nearby stood two other Augustan projects: his Mausoleum, begun fifteen years earlier, and the great sundial whose gnomon was an Egyptian obelisk. The three were read together by anyone walking in from the north.
What survives today is an enclosure of Luna marble — the quarries above modern Carrara — open to the sky, with a small altar inside it. The outer walls carry the sculpture the monument is famous for: mythological scenes on the short sides, and on the long sides a procession of real people — senators, priests, magistrates, the imperial family, children who fidget and tug at adult clothing.
Four panels, and what they actually show
The short walls carried four mythological panels. Two survive well, two barely at all, and knowing which is which saves a visitor from believing the captions on postcards.
Aeneas sacrificing is the best preserved. The Trojan ancestor of the Julian family, accompanied by his son and two attendants, offers a sow to the household gods. It is a scene about lineage: Augustus's family traced itself to Aeneas, and through him to Venus.
The Lupercal panel opposite is highly fragmentary. It appears to show the cave on the Palatine where the she-wolf suckled Romulus and Remus, with Mars and the shepherd Faustulus present.
The seated woman with two infants on the east side is the panel everyone photographs. Scholars have identified her as Tellus, as Italia, as Venus and as Peace herself; the disagreement is old and unresolved. She sits among fruit, cattle and reeds, flanked by two figures usually read as the winds of air and sea.
The fourth panel, showing Roma, is mostly lost. What remains suggests the goddess seated on armour, probably with Honos beside her.
The procession is a group portrait
Along the north and south walls moves a line of figures in low relief. They are not generic Romans. Senators, magistrates and priests in their pointed caps walk with the imperial household — Agrippa with his toga drawn over his head, Livia, Tiberius, Drusus, Julia, the boy Gaius — in what may be the procession of 4 July 13 BC, the day the Senate voted the altar.
Look slowly and two things surface. Children appear among the adults, holding hands, visibly bored, one tugging at a toga to be picked up. The museum puts it plainly: this is the first time Augustus and his family, children included, appear on a public monument (arapacis.it). And the depth of carving changes across the file: figures at the front stand nearly free of the stone, those behind sink into it, so the crowd reads as a crowd rather than a row.
Below the procession runs a band of acanthus scroll with small animals hidden in it: lizards, frogs, a snake at a bird's nest. The detail is small and easy to walk past; a phone with a zoom earns its keep here.
How the altar came back, piece by piece, over four centuries
The Ara Pacis spent most of its life underground, under what is now Palazzo Fiano-Almagià near Via in Lucina, and it came back in stages rather than in a single discovery.
The sixteenth century. The first trace is an engraving by Agostino Veneziano made before 1536, showing a swan with spread wings and a length of scrolled frieze — proof that carved blocks had already come out of the ground. The museum dates the first recovery to 1566, when cardinal Giovanni Ricci di Montepulciano acquired nine large carved blocks from the altar (arapacis.it, «The rediscovery»). Other accounts put the find at 1568 and credit the purchase to the Grand Duke of Tuscany, which is the version usually given for the panels now in the Uffizi (romeandart.eu). The two are not reconcilable, and a monument recovered over four centuries deserves both rather than a tidy single date.
The cardinal's purchase also explains an address that has confused descriptions of the altar ever since. Ricci had bought the estate on the Pincian Hill in 1564; after his death his heirs sold it, in 1576, to cardinal Ferdinando de' Medici, and it has been the Villa Medici since. In 1587 Ferdinando inherited Tuscany and its grand-ducal title. That is worth holding next to the rival account above, though the chronology does not line up neatly: the title itself was created for Cosimo I only in 1569, so a purchase in 1568 could not have been made by a grand duke of Tuscany at all. Fragments stayed at the villa, others reached the Vatican and the Louvre. The Medici owned the house; they had nothing to do with what is carved on the marble.
1859. Building work under the same palazzo, by then owned by the Duke of Fiano, turned up the altar's base and more sculpture. Friedrich von Duhn later recognised the fragments as parts of one monument, and it was that identification which, in 1903, prompted the request to the Ministry of Public Education to dig further.
1903. The first systematic dig reached about half the monument and recovered 53 fragments, then stopped: the ground was waterlogged and the palazzo above was at risk.
1937–1938. The Italian government ordered the excavation resumed for the two-thousandth anniversary of Augustus's birth. Engineers froze the waterlogged soil to work in it, and what could not be recovered was replaced with casts of pieces held in other museums. Between June and September 1938 a pavilion went up beside the Tiber, next to the Mausoleum, and Mussolini inaugurated it on 23 September 1938.
That last date explains a lot about the monument's modern reputation. The reassembled altar was a political instrument twice over: once for Augustus, once for a regime that wanted to be seen as his heir.
The building around it, and the argument about it
The pavilion of 1938 was designed by Vittorio Ballio Morpurgo. It lasted sixty-eight years. In 2006 it was demolished and replaced by the present museum, designed by Richard Meier and opened on 21 April, Rome's traditional birthday.
Meier's building was the first new architecture in the historic centre of Rome since the fall of Fascism, and the reaction was loud. Critics called the travertine-and-glass box an intrusion on the Piazza Augusto Imperatore; defenders pointed out that the altar had been sitting behind failing glass, exposed to traffic exhaust from the Lungotevere, and that the marble was visibly darkening.
Whatever one thinks of the exterior, the interior does one thing very well: the altar stands in daylight, at eye level, with room to walk around it. Most Roman sculpture of this quality is seen in a gallery, above head height or behind a rope.
Visiting: hours, tickets and the practical part
The museum is at Lungotevere in Augusta, at the corner of Via Tomacelli, a ten-minute walk from the Spanish Steps.
Hours. Open every day, 9.30 to 19.30, with last admission one hour before closing. On 24 and 31 December it closes at 14.00; on 1 January it opens late, 11.00 to 20.00. Closed on 1 May and 25 December.
Tickets. Full price is €14.00, reduced €8.50. Buying online or through the 060608 call centre adds a €1 presale fee and is required only for future dates — for the same day you can pay at the desk without the fee. Advance tickets cannot be refunded or exchanged.
Free admission. Since February 2026 residents of Rome and the metropolitan area enter free on presentation of an identity document, and MIC cardholders enter free as well. Both exemptions cover the altar but not the temporary exhibition space, which is ticketed separately.
Guides. A video guide to the permanent display costs €6.00 and an audio guide €4.00, both in Italian, English, French, German and Spanish, sold at the ticket desk. A kit of 25 radio guides with a transmitter costs €18.00 and cannot be reserved in advance.
Since 27 March 2026 the museum also runs L'Ara si rivela, a projection-mapping show that restores the altar's original paint on the marble for a few minutes. It is ticketed separately and runs in the evening; the museum publishes the rates on its own page, and they have changed once already this year.
Allow an hour for the altar itself if you read the panels, two if you take the audio guide and the lower frieze seriously. It pairs naturally with the other city museums and fits a morning in any three-day Rome itinerary. The museum is small by Roman standards, which is its advantage: it is one of the few places in the centre where a single object gets the room it deserves.
Opening times, prices and the excavation history above were checked against the museum's own pages (arapacis.it, opened 22 September 2026); where the sixteenth-century find is concerned, the museum's account and the older literature disagree, and both are given.