Numa and the Nymph Egeria

At a Glance

Central figures: Numa Pompilius, the second king of Rome, a Sabine from Cures known for his devotion to religious law; and Egeria, a nymph of springs and counsel who met him in a sacred grove outside the city walls.
Setting: Rome in the years following Romulus’s death, roughly 715-673 BCE according to tradition; the grove of the Camenae near the Porta Capena, and the spring sacred to Egeria on the Appian Way. Sources include Livy’s Ab Urbe Condita, Plutarch’s Life of Numa, and Ovid’s Metamorphoses and Fasti.
The turn: Numa, elected king of a city that knew only war, began leaving Rome at night to consult Egeria in her grove, and from these meetings he brought back the religious institutions that would govern Roman life for centuries.
The outcome: Numa established the calendar of festivals, created the priestly colleges of the pontifices and flamines, built the Temple of Janus, founded the Vestal order, and gave Rome a structure of sacred law that replaced violence with ritual. When Numa died, Egeria dissolved into her own spring with grief.
The legacy: The sacred spring of Egeria outside the Porta Capena remained a site of worship into the imperial period, and the priestly institutions Numa established - the pontifices, the flamines, the Vestals - endured for over a thousand years.

Romulus was gone. Whether the senators had torn him apart with their own hands or whether, as the official story held, a sudden storm had swept him bodily into the sky to become the god Quirinus - either way, the throne was empty, and Rome was a city that had known only one thing for a generation: fighting.

The Romans and the Sabines who had merged into one people after the famous abduction could not agree on a successor. Each faction wanted its own man. The deadlock might have broken into civil war except that both sides settled on a name no one had expected: Numa Pompilius, a Sabine from the town of Cures, who was known for exactly one thing. He was pious. Not pious the way a general is pious before battle, making quick offerings so Mars will look the other way. Numa was pious the way a priest is pious - attentive, quiet, precise about what was owed to the gods.

He did not want the crown.

The Reluctant King

They sent a delegation to Cures. Numa was forty years old, a widower. His wife Tatia had died, and he had withdrawn from public life to study the movements of the heavens and the proper forms of worship. When the Roman envoys told him the Senate and people had chosen him as king, Numa refused. He told them his temperament was wrong for it. Rome was a city raised on war; it needed a king who could fight. He was a man who listened to water.

His father, Pomponius, and a kinsman named Marcius argued with him. They said this was precisely why Rome needed him. Romulus had given the city its walls and its army. What it lacked was a relationship with the gods that went deeper than battlefield sacrifice. Numa relented, but on his own terms. He would not take the throne until the augurs confirmed Jupiter’s approval. He went to the Capitoline, sat on a stone facing south, and waited while an augur watched the sky. The birds came right. Numa accepted.

The Grove of the Camenae

Almost immediately, Numa began disappearing from the city at night. He went south, past the Porta Capena, to a small grove where ancient springs fed into a stream. This was the grove of the Camenae - water-goddesses whom the Romans associated with prophecy and song. There, beside a spring that came out of the rock cold and clear, he met Egeria.

Who she was depends on who tells it. Livy is cautious: he says Numa claimed to meet a goddess by night and that her counsel guided his religious reforms. Whether Livy believed this, he does not say. Plutarch reports it more generously. Ovid, who loved a nymph, treats Egeria as entirely real - a deity of flowing water, intelligent, devoted to Numa, and stricken when he died. What none of the sources dispute is the effect. Numa came back from those nighttime meetings with laws.

Not laws of property or punishment. Laws of worship. He returned with the structure of the Roman religious calendar - which days were fasti, open for public business, and which were nefasti, reserved for the gods. He returned with the forms of prayer, the proper sacrifices for each deity, the exact words a priest must speak when consecrating a boundary stone or opening a temple door.

The Institutions

Numa created the college of pontifices, headed by a pontifex maximus, to oversee all public religion. He established the flamines - individual priests assigned to specific gods. The flamen Dialis served Jupiter and could not touch a horse, see an army in formation, or remove his cap outdoors. The flamen Martialis served Mars. The flamen Quirinalis served the god Romulus had become.

He founded the order of the Vestal Virgins, choosing the first four from patrician families. They tended the sacred fire in the round temple of Vesta in the Forum. If the fire went out, the city’s contract with the gods was broken. If a Vestal broke her vow of chastity, she was buried alive in a small chamber near the Colline Gate with a loaf of bread, a jug of water, and a lamp - so that no one could say Rome had starved a consecrated woman.

Numa built the Temple of Janus, the two-faced god of doorways and beginnings, at the northeast corner of the Forum. Its doors stood open in wartime, closed in peace. Under Romulus, they had never been shut. Under Numa, they stayed shut for forty-three years. The entire span of his reign passed without a war.

He also reorganized the calendar itself. Romulus’s calendar had only ten months. Numa added January, for Janus, and February, for the purification rites of the Februa. He fixed the intercalary days. He assigned each month its festivals: the Lupercalia in February, the Parilia in April, the Saturnalia in December. Every day of the Roman year had a designation, a deity, an obligation. Nothing was left to chance.

The Spring at the Porta Capena

Through all of this, he continued going to the grove. Plutarch says the Romans wondered about it but did not object to the results. A city that had been torn between factions was suddenly unified by shared ritual. People who had been Sabine and people who had been Roman were now simply Quirites - citizens - bound together not by conquest but by a common calendar of worship.

Egeria’s counsel, whatever form it took, gave Numa something no augury could provide: confidence that the structures he was building were correct. The priesthoods, the festivals, the temple protocols, the exact formulas of prayer - these were not improvised. They came from somewhere outside Numa’s own intelligence, and the Romans believed that somewhere was the spring in the grove.

Egeria’s Grief

Numa died in 673 BCE, old and revered. He was buried at the foot of the Janiculum, and a second coffin beside his held the sacred books he had written - the texts of the rituals, the priestly calendars, the formulas. Centuries later, in 181 BCE, a flood uncovered the coffin of books, and the Senate examined them, found them too dangerous for public knowledge, and burned them in the Comitium.

Egeria did not survive Numa’s death in any form the Romans could recognize. Ovid tells it plainly. She fled from the grove into the forests of Aricia, near the lake sacred to Diana, and wept until she could no longer hold her shape. Diana, pitying her, transformed her into a spring. The water ran clear and cold, and it never stopped running.

The spring at the Porta Capena continued to flow. Women came to it for centuries - pregnant women especially, because Egeria was said to ease the passage of childbirth. They left small offerings at the rock where the water emerged. Juvenal, writing in the imperial period, complained that the grove had become shabby, rented out to beggars. But the water still came.