|Location||Regione VIII Forum Romanum|
|Built in||unknown old Kingdom era|
|Built by/for||Unknown builder|
|Type of structure||Ancient Type of Domus|
|Related||Julius Caesar, Assassination of Julius Caesar, Temple of Caesar, Pontifex Maximus|
The Regia was a structure in Ancient Rome in the Roman Forum that originally served as the residence or one of the main headquarters of kings of Rome and later as the office of the Pontifex Maximus, the high priest of Roman religion. It occupied a triangular patch of terrain between the Temple of Vesta, the Temple of Divus Julius and Temple of Antoninus and Faustina. Only the foundations of Republican/Imperial Regia remain. Like the Curia it was destroyed and rebuilt several times, as far back as the Roman monarchy. Studies have found multiple layers of similar buildings with more regular features, prompting the theory that this "Republican Regia" was to have a different use.[further explanation needed]
According to ancient tradition it was built by the second king of Rome, Numa Pompilius as a royal palace. Indeed, the Latin term regia can be translated as royal residence. It is said that he also built the Temple of Vesta and the House of the Vestal Virgins as well as the Domus Publica. This created a central area for political and religious life in the city and Kingdom. When Caesar became Pontifex Maximus he exercised his duties from the Regia.
The archives of the pontifices were kept here, the formulas of all kinds of prayers, vows, sacrifices, etc., the state calendar of sacred days, the Annales- the record of events of each year for public reference- and the laws relating to marriage, death, wills, etc.
The Regia was the place of assembly of the College of Pontiffs and at times of the Fratres Arvales. It was burned and restored in 148 BC (for a possible burning by the Gauls in 390 BC, see Mem. Am. Acad. ii.59-60); and again in 36 BC, eight years after the death of Julius Caesar, when the restoration was carried out in marble by Gnaeus Domitius Calvinus, on the regal foundation.
The surviving ruins in the forum are probably not from the original building. Destroyed by earthquake, fire or the sacking of the city, the original "Regia" may have been rebuilt in a different location.
The rebuilt structure had an irregularly formed enclosed courtyard that was paved in tuff with a wooden portico. The interior was divided into three rooms with entrance from the courtyard into the middle room.
The West Room was the shrine of Mars, sacrarium Martis, in which the ancilia (shields) of Mars were stored. Here, too, stood the lances that were consecrated to Mars, the hastae Martiae. According to legend if the lances in the Shrine of Mars start vibrating something terrible would happen. They are said to have vibrated on the night of 14 March 44 BC. Caesar, High Priest at the time, in spite of the vibrating lances left the Regia to attend at the meeting of the Senate where he was assassinated.
- Losehand, Joachim (2007). Häuser für die Herrscher Roms und Athens?: Überlegungen zu Funktion und Bedeutung von Gebäude F auf der Athener Agora und der Regia auf dem Forum Romanum. Hamburg: Dr. Kovac. ISBN 3-8300-3397-4.