Regia

• 1. Introduction

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  The Regia stood at the edge of the Roman Forum, on a triangular patch of ground squeezed between three temples, and for centuries it held a secret. On the night of the 14th of March 44 BC, something strange happened inside its walls. The sacred lances of Mars, stored in a shrine in the building's western room, began to vibrate. The Pontifex Maximus at the time was Julius Caesar. He noticed. He left anyway. That night he was assassinated at a meeting of the Senate.

  That story, reported by the historian Cassius Dio, captures what made the Regia so unusual among Rome's ancient buildings. It was not simply a palace or an office. It was the place where the sacred and the political collided, where war omens and state archives shared the same roof, where kings once lived and priests later governed. The questions the Regia raises are about power and continuity: how does a royal residence become a priestly headquarters? What did it actually contain? And how many times was it destroyed before the version archaeologists found in the nineteenth century?

• 2. A Palace Becomes a Priesthood

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  Numa Pompilius, the second king of Rome according to ancient tradition, was credited with building the Regia as a royal palace. The Latin word regia translates directly as royal residence, and the structure's original purpose was exactly that: a main headquarters for the kings of Rome. Numa was also said to have built the Temple of Vesta and the House of the Vestal Virgins, along with the Domus Publica, creating a concentrated zone of political and religious authority at the city's heart.

  When the Roman monarchy ended and the republic took shape, the building did not vanish. Its role shifted. The Regia became the office of the pontifex maximus, Rome's highest religious official. Julius Caesar held that title, and he conducted his priestly duties from within the Regia. The College of Pontiffs assembled there. At times the Fratres Arvales, a brotherhood of priests tied to agricultural rites, also gathered inside its walls.

  The archives of the pontifices were stored in the building as well. These were not merely religious texts. The archives contained the formulas for prayers, vows, and sacrifices; the state calendar of sacred days; a year-by-year public record of events called the Annales; and the laws governing marriage, death, and wills. The Regia, in other words, held the operational records of Roman civic life, from harvests and holy days to the rules by which families passed property to their children.

• 3. The Rooms Inside

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  The rebuilt Regia had an irregularly formed enclosed courtyard, paved in tuff with a wooden portico running around it. Three rooms opened off the interior, with entrance through the courtyard into the middle room.

  The western room was the shrine of Mars, the sacrarium Martis. Inside it stood the ancilia, the sacred shields of Mars, and the hastae Martiae, the lances consecrated to Mars. Aulus Gellius recorded the legend that if those lances began to vibrate, catastrophe was coming. The reported vibration on the night of the 14th of March 44 BC gave that legend a specific, documented moment attached to the most famous assassination in Roman history.

  The eastern room held a sanctuary dedicated to Ops Consiva. This space was so restricted in access that only two categories of people were permitted inside: the pontifex maximus and the Vestal Virgins. No senator, no general, no emperor entered that room without one of those titles. The level of restriction placed on the eastern sanctuary tells something about the hierarchy of sacred space the Romans maintained even within a single building.

  At some point during the seventh or eighth century, the structure was transformed into a private residential building. The same walls that had stored state archives and housed war omens eventually became someone's home.

• 4. Destruction and Marble

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  The Regia was burned and restored at least twice in the Republican period. The first recorded destruction came in 148 BC. The second came in 36 BC, eight years after Caesar's death. That second restoration is notable for one reason: it was carried out in marble, on the original regal foundation, by Gnaeus Domitius Calvinus.

  The choice of marble mattered. Earlier versions of the Regia had been built with more modest materials. Marble was a statement of permanence and prestige. Calvinus rebuilt the structure on the same footprint the kings had used, but in a material that signaled Rome's changed ambitions. The phrase "regal foundation" in the ancient sources suggests that even after centuries of destruction and repair, builders returned deliberately to the same ground the original palace had occupied.

  Archaeological studies of the site found multiple layers of buildings beneath the Imperial-era remains, with each layer showing more regular and deliberate features than the last. This led researchers to a hypothesis: the version of the Regia associated with the Republic may have been intended for a different use than the monarchical version. What that use was remains an open question, because a comprehensive publication of the site had not yet appeared at the time the most recent excavations were conducted.

• 5. Digging Up the Regia

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  The site was first cleared between 1872 and 1875. A year later, in 1876, F. Dutert discussed its remains in a volume on the Forum Romanum. A decade passed before Nichols formally identified the site as the Regia, in 1886. Hülsen returned to excavate again in 1889.

  The Italian archaeologist Giacomo Boni conducted excavations at the site in 1899. Those digs contributed to the layered picture of the building's long history. The American archaeologist Frank Brown dug at the site in the 1930s and returned in the 1960s. The architectural terracottas recovered from Brown's excavations were published in 1995, decades after his later campaign ended.

  Today, only the foundations of the Republican and Imperial Regia survive. The site sits between the Temple of Vesta, the Temple of Divus Julius, and the Temple of Antoninus and Faustina, on the triangular patch of terrain it has occupied since the time of the kings. The lances stored in the western room are long gone. But the terracottas Frank Brown pulled from the ground in those mid-century campaigns are now part of the published record, and a comprehensive archaeological account of the full site remains, as of the most recent studies, still forthcoming.