Obelisk of Montecitorio

• 1. Introduction

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  The Obelisk of Montecitorio stands in the heart of Rome, a red granite needle quarried at Aswan more than two and a half thousand years ago. It was cut during the reign of the Egyptian pharaoh Psamtik II, who ruled from 595 to 589 BC, and erected at the sanctuary of Ra in Heliopolis. Its hieroglyphic inscriptions hail him as "the Golden Horus, beautifying the Two Lands" and "the King of Upper and Lower Egypt, Neferibre, beloved of Re-Harakhti." The stone's first life was as a monument to divine kingship in Egypt. Its second life, imported to Rome in 10 BC by the Emperor Augustus, would put it to work as the needle of the largest sundial in the ancient world. But then the obelisk fell. It was buried. It was lost for centuries. And what replaced it, when it was finally raised again, tells a story about power, memory, and the long reach of the past.

• 2. The Pharaoh's Needle

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  Aswan provided the raw material. Workers quarried the red granite there and transported it northward to Heliopolis, where it was raised at the sanctuary of Ra during Psamtik II's brief reign of roughly six years. The pyramidion at the top of the shaft carried its own inscription, addressing the pharaoh as "son of Re" and invoking the sky god Re Horachty as "great god lord of the sky." The text promises him "all life and all health for ever." Psamtik II himself is named in the pyramidion inscription as "Psamchek II," the Greek rendering of his Egyptian name. The obelisk's four sides carried additional inscriptions linking him to Atum, lord of Heliopolis, and to the souls of that sacred city. The stone was not merely decorative. It was a statement of divine legitimacy inscribed in granite, built to outlast the reign of the man who commissioned it.

• 3. Augustus and the Giant Sundial

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  In 10 BC, Emperor Augustus ordered the obelisk shipped to Rome alongside the Flaminio Obelisk, the two arriving together across the Mediterranean. Augustus planted his prize in the Campus Martius and gave it a new role: gnomon for the Solarium Augusti, an enormous sundial he built there. The meridian was designed by the mathematician Facondius Novus. It covered a surface measuring 160 by 75 meters, paved with travertine slabs onto which bronze letters marked out the hours, months, seasons, and signs of the zodiac. The shadow of the obelisk moved across this grid, turning the Campus Martius into a working astronomical instrument. Augustus's inscription on the base declared the obelisk a gift to the sun, placed there after "having reduced Egypt into the sovereignty of the Roman people." The obelisk also carried a second function. Carefully oriented, its shadow fell on the nearby Ara Pacis, the Altar of Peace, on the 23rd of September each year. That date was Augustus's birthday and coincided with the autumnal equinox. Scholars have read this alignment as a calculated statement: the shadow connecting the obelisk to the goddess Pax on the emperor's own birthday, both "sanctioning his divine right to rule" and, as some have argued, asserting his right to found a dynasty. Pliny the Elder recorded the sundial's design in detail in his Naturalis Historia, noting that Augustus put the obelisk "to use in a remarkable way so as to mark the sun's shadow and thereby the lengths of days." Pliny also recorded a failure: the horologic stopped working correctly around 30 years after its construction, by the 40s AD.

• 4. Collapse and Burial

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  Sometime between the 9th and 11th centuries, the obelisk fell. The cause is uncertain. Candidates include fire, earthquake, and the violence of war. One documented earthquake struck in 849. The siege of Rome in 1084 by Robert Guiscard is another candidate. Whatever brought it down, the obelisk did not simply topple. It gradually became buried beneath the accumulated layers of the city. Pope Sixtus V, who lived from 1520 to 1590, made attempts to raise the obelisk but got nowhere. Some fragments had been found in 1502 in a cellar off the area then called the Largo dell'Impresa, near what is now the Piazza del Parlamento. Later, during the pontificate of Benedict XIV in 1748, workers found traces of the ancient meridian under the main entrance of Piazza del Parlamento 3, positioned exactly as Pliny had described it. A piece of meridian excavated from the cellar of a stable on a street in the Campus Martius still carried the Greek-letter markings for various months, set into its travertine slabs. Another fragment was believed to lie in a mosaic still visible in the foundation of the Church of San Lorenzo in Lucina. The obelisk and its meridian had scattered across the neighborhood in pieces.

• 5. Restoration and Return

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  Pope Pius VI launched intensive restoration works between 1789 and 1792. He entrusted the project to the architect Giovanni Antinori, who faced a practical problem: parts of the original granite shaft were damaged or missing. Antinori filled the gaps using granite taken from the Column of Antoninus Pius, a Roman monument that itself carried famous imagery of this very part of Rome. The column's base relief shows a solar obelisk held as a symbol of the Campus Martius region, personified as a figure. That base is preserved today in the Vatican Museums. Antinori's restored obelisk was raised and reconfigured as a sundial. It now stands 21.79 meters high, or 33.97 meters if the base and globe are included. It was placed in the Piazza Montecitorio, not in the exact location of the original Solarium Augusti, which had stood in the space behind what was then called the Curia innocenziana and is now called the Palazzo Montecitorio. The displacement matters: by moving the stone to a new position, the astronomical alignment was lost permanently.

• 6. A Meridian Without a Shadow

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  On the 7th of June 1998, a newly redesigned Piazza Montecitorio was inaugurated, and with it came a new meridian traced on the pavement as a tribute to Augustus's ancient sundial. The line was oriented toward the main entrance of the palazzo. The problem is that the obelisk's shadow no longer points in that direction. The gnomonic function of the stone, its original purpose as an astronomical instrument, is definitively lost. What remains is the granite itself: more than two thousand years old, inscribed with the names of a pharaoh and an emperor, quarried at Aswan and shipped to Heliopolis, then to Rome, then buried and scattered, then raised again in a new square that is only a short distance from where Augustus first pointed it at the sky.