Plutarch's Life of Numa Pompilius tells how a peace-loving Sabine philosopher-king was chosen to succeed the war-founded Rome of Romulus and refounded the city on religion, law, and the calendar instead of conquest.
Plutarch's Numa Pompilius opens not with the man but with a dispute over chronology -- whether Numa could really have studied under Pythagoras, given how the dates line up -- and that argument about evidence sets the tone for the whole Life. After Romulus vanishes in a storm and the Romans quarrel over succession, the patricians settle on a compromise candidate: Numa, a Sabine from Cures who had married into Rome's founding generation but never sought power, famous instead for a quiet, disciplined life spent wandering sacred groves and, by report, keeping company with the divine nymph Egeria. Envoys travel to fetch him, he resists at length, and only after omens are taken on the Tarpeian hill does he accept the kingship.
Once in office, Numa systematically undoes what Romulus built. He disbands the royal bodyguard, replaces military ambition with priesthoods, festivals, and processions, and is credited with founding the Pontifices, the Vestal Virgins and their eternal fire, the war-and-peace priesthood of the Fetiales, and the leaping priest-dancers called the Salii, whose sacred shield is said to have fallen from the sky to end a plague. He reforms the lunar calendar toward the solar year, adding January and February and reordering the months; he redraws Rome's boundaries under the new god Terminus; he redistributes land to the poor and reorganizes the citizenry by trade rather than by the old Roman-versus-Sabine factions, in each case using religious ritual to dissolve civic rivalry. Plutarch keeps circling back to the Pythagoras question -- weighing the myths of Numa's night meetings with Jupiter, his capture of the prophetic spirits Picus and Faunus, and his supposed philosophical schooling -- without ever quite deciding it, treating the uncertainty itself as instructive.
The Life matters historically because it is one of antiquity's clearest arguments that a state can be built on cult and law rather than war, and Plutarch uses Numa's forty-three peaceful years, and the closed doors of the Temple of Janus, as proof of concept before he pairs the Life with Lycurgus of Sparta for formal comparison. It is also a case study in how Greco-Roman biography handles legend: rather than debunking the miracle stories about Egeria or the sky-shield, Plutarch weighs conflicting sources, flags what looks like myth, and lets probability rather than dogma decide -- a method as much on display here as the history of Rome's earliest religious institutions.
“but rather, having tasted a more solemn kind of intercourse and been deemed worthy of divine marriage, he consorted and lived together with the divine spirit Egeria, who loved him, and so became a happy man and one instructed in things divine.”
— Numa Pompilius
“So, deliberating among themselves, they designated Numa Pompilius, a Sabine, a man who had not been among those who settled in Rome, but who was so well known to all for his virtue that when his name was proposed, the Sabines accepted it even more eagerly than those who had chosen him.”
— Numa Pompilius
“First, they say, he also established a shrine of Faith and of Terminus. Faith he made the greatest oath of the Romans, one which they continue to use to this day; Terminus would be a boundary-god, and both publicly and privately they sacrifice to him along the boundary-lines of their fields”
— Numa Pompilius
“For perhaps there is no need at all of compulsion or threat toward the many; rather, seeing virtue itself set forth in a clear and shining example in the life of their ruler, they of their own accord become moderate and are shaped, in friendship and concord with him, toward a blameless and blessed life lived with justice and moderation”
— Numa Pompilius
“They did not, however, give his body to the fire, since he himself, it is said, had forbidden it; instead, having made two stone coffins, they set them beneath the Janiculum, one containing his body, the other the sacred books which he himself had written, just as the Greek lawgivers wrote their tables of laws.”
— Numa Pompilius
Plutarch treats this as an open question rather than settled fact. He notes that the dates do not comfortably align -- Pythagoras is generally placed after Numa's reign -- and considers rival theories, including a different, otherwise obscure Pythagoras of Sparta. He ultimately leaves the matter unresolved, using it to illustrate how legend accretes around admired figures.
Egeria is described as a divine spirit or nymph with whom Numa was said to consort in sacred groves, a relationship Plutarch compares to other Greek myths of mortals favored by gods, such as Endymion. Plutarch reports the story as tradition rather than endorsing it outright, and notes the Egyptian view that a divinity's 'breath' rather than physical union might explain such tales.
He disbanded Romulus's bodyguard, founded major priesthoods including the Pontifices, the Vestal Virgins, and the Fetiales, reformed the calendar by adding January and February, redistributed land, reorganized citizens by trade to dissolve Roman-Sabine rivalry, and consecrated the boundary-god Terminus. Plutarch credits these institutions with transforming Rome from a war-hardened city into a peaceful one.
The temple's twin doors stood open during war and closed during peace, and Plutarch notes it remained closed throughout Numa's entire reign -- a rare feat only repeated centuries later under Augustus. Plutarch uses this detail as the clearest external proof that Numa's peace was real and sustained, not just self-praise in the sources.
Finding the Roman lunar calendar out of step with the solar year by about eleven days, Numa adjusted the count and rearranged the sequence of months, moving March from first position to third and instituting January and February. Plutarch also digresses on the Roman months' naming after gods like Mars, Venus, Maia, and Juno.
According to the account Plutarch relates, Numa refused cremation and was buried in a stone coffin beneath the Janiculum hill alongside a second coffin containing sacred books he had written for the priests. He reportedly ordered the books buried with him on the principle that such teachings should not survive as mere lifeless writing once their living interpreter was gone.
Numa is paired with Lycurgus, the semi-legendary lawgiver of Sparta, as both men are credited with founding a state's character through law, religion, and constitutional order rather than conquest. The comparison follows the biographical pattern of Plutarch's Lives, matching a Roman figure with a Greek counterpart of similar type.
Plutarch reports these stories -- the shield said to have fallen from heaven to end a plague, and Numa's capture of the spirits Picus and Faunus to summon Jupiter -- as inherited tradition, but explicitly calls some of them 'mythical and absurd' even as he records them. He is more interested in what the stories reveal about Numa's reputation for piety than in vouching for their truth.
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