Si deus si dea is an Archaic Latin phrase meaning "whether god or goddess", used to address a deity of unknown gender. It was also written sive deus sive dea, sei deus sei dea, or sive mas sive femina ("whether male or female").
The phrase can be found on several ancient monuments. Archaic Roman inscriptions such as this might have written to protect the identity of the god if Rome were ever captured by an enemy.[1] The construction was often used when invoking the god of a place (e.g., "Be you god or goddess who reigns over Carthage, grant us..."). Historian Edward Courtney believes it was "intended to cover all bases as an acknowledgement of the limitations of human knowledge about divine powers,"[2] similar to the Greek Unknown God.
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In 1820, an altar was discovered on the Palatine Hill with an Old Latin inscription,[3]
which can be transliterated into the modern alphabet as[4]
and translated as
The altar has been dated as a late Roman Republic restoration of an Archaic original. In the 19th century it was misidentified as a famous altar to Aius Locutius,[5] but the real identity of the divinity cannot be known, as it is not even specified whether it is a god or a goddess. The praetor Caius Sextius C.f. Calvinus may have restored an earlier altar reading "sei deo sei deivae" for the reasons described above,[1] or he may have been restoring an altar which had been forgotten and left to decay, and the god or goddess it was dedicated to was no longer remembered by any Roman.
Close to the site, four inscribed columns were found dating to the Julio-Claudian period. Column A (now missing) read "Marspiter," or "Father Mars" in Archaic Latin. Column B reads "Remureine," which possibly means "In Memory of Remus." Column C reads "anabestas," possibly a goddess named Anabesta,[6] or else related to the Greek anabasio ("to go up") and interpreted as a reference to Remus' scaling of the Roman walls. Column D, the longest inscription, reads:
Livy ascribes the institution of the fetiales to Ancus Marcius , and claims that the ius fetiale came to Rome by the Aequicoli.[7]