Janus and the January Calends

At a Glance

Central figures: Janus, the two-faced god of doorways, beginnings, and transitions; Numa Pompilius, Rome’s second king and shaper of its religious calendar.
Setting: Rome during the reign of Numa Pompilius, particularly the Argiletum district near the northeast corner of the Forum, where Numa built the temple of Janus Geminus; drawn from Ovid’s Fasti, Livy’s Ab Urbe Condita, Varro’s De Lingua Latina, and Macrobius’s Saturnalia.
The turn: Numa Pompilius placed January first in the Roman calendar, displacing March, and established the Calends of January as a day sacred to Janus - binding the god of beginnings to the beginning of the civic year.
The outcome: Janus received the first invocation in every Roman prayer and the first offering in every sacrifice, a privilege no other deity held, not even Jupiter; his bronze double gates on the Argiletum stood open in war and closed in peace.
The legacy: The Calends of January became the Roman new year, marked by the exchange of strenae - gifts of dates, figs, honey, and coins - and by formal prayers to Janus for safe passage into the year ahead; the month itself still carries his name.

The gates stood open more often than they were closed. That was the practical truth of the shrine Numa Pompilius built on the Argiletum, where the road from the Forum bent northeast toward the Esquiline. Two bronze doors set in a low stone passage, and above the lintel a face looking out toward each door - one bearded, one smooth, or both bearded depending on which sculptor’s hand you trusted. The shrine had no roof. Rain fell on the cobbles between the doors. When both doors stood shut, it meant Rome was at peace. In the seven centuries between Numa and Augustus, the doors were closed three times.

But the gates were a later matter. Before the bronze and the stone, before the shrine on the Argiletum, there was Janus himself, and the question Numa brought to him at the start of everything.

The God Who Was Already There

Janus was not imported. He was not a Greek god renamed, not a Trojan exile, not a concept borrowed from the East. Varro placed him among the indigetes - the native gods, the ones who had no origin story because they preceded stories. He was the numen of the threshold, the power that inhered in every doorway, every gate, every moment of passage from one state to another. A Roman stepping from the atrium into the street passed through Janus. A bride carried across her husband’s threshold passed through Janus. A general marching his army out of the city passed through Janus.

He had two faces because a door has two sides. One face looked at what you were leaving. The other looked at where you were going. Nothing about this required explanation to a Roman. It was as obvious as the hinge.

The difficulty was that Janus, being the god of all beginnings, claimed priority over every other god. Not rank - priority. He did not rule the sky like Jupiter or command the sea like Neptune. But he came first. Every prayer, no matter which deity it addressed, opened with an invocation to Janus. Every sacrifice, even one offered to Jupiter Optimus Maximus on the Capitoline, began with a preliminary offering to Janus. Ovid, in the Fasti, has the god explain this himself: I sit at the threshold of the year, as I sit at every threshold. Whatever you begin, you begin through me.

Numa and the Calendar

When Romulus vanished - taken up in a storm cloud, or torn apart by senators, depending on which account you preferred - the city had no calendar worth the name. The year began in March, the month of Mars, because Mars was the father of Romulus and because March was when armies marched. There were ten named months. The dark stretch between December and March had no months at all; it was simply winter, an unnamed gap.

Numa Pompilius, the Sabine who became Rome’s second king, found this intolerable. He was a man of ritual precision, a pontifex before the word existed, and he spent his reign organizing the relationship between the city and its gods. He established the flamens, the Vestals, the Salii. He divided the days of the year into fasti and nefasti - days when public business could be conducted and days when it could not. And he added two months to fill the gap: January and February.

January he placed first. Not because it fell first in the agricultural cycle - that was still March, still the beginning of the campaigning season, still the month the fields were plowed. Numa put January first because it belonged to Janus, and Janus was the god of beginnings. The logic was circular and perfect. If every act begins through Janus, then the year begins through Janus. If the year begins through Janus, then his month comes first.

The Calends

The Calends - the first day of any month - were already sacred. The word Calendae came from calare, to call out, because on the first of each month the pontifex minor stood on the Capitoline and announced how many days remained until the Nones. But the Calends of January carried a weight the other Calends did not.

On the morning of the first of January, the new consuls took office. They climbed the Capitoline in their togae praetextae, white wool bordered with purple, preceded by lictors carrying the fasces. At the temple of Jupiter Optimus Maximus they sacrificed a white bull. But before that sacrifice - before the bull, before Jupiter - they turned first to Janus. The offering was modest: wine, incense, a cake of spelt. The prayer asked for a good beginning. Janus received it in silence, both faces watching.

In private homes, the day started with strenae. These were gifts exchanged between neighbors and patrons and clients - branches cut from the grove of the goddess Strenia on the Via Sacra, dates and dried figs dipped in honey, small coins stamped with Janus’s double face. The gifts were not lavish. They were tokens of good faith, a way of beginning the year with sweetness and open hands. Macrobius recorded the custom and traced it back to Numa’s reign, though the details blurred at that distance.

The Open and the Shut

Numa built the shrine on the Argiletum as a kind of barometer. When both gates stood open, Rome was at war somewhere. When both were shut, the entire Roman world was at peace. Numa closed them himself after he secured peace with Rome’s neighbors, and the sources are clear that this was remarkable even at the time - a Roman king who preferred negotiation to the sword, who organized the calendar around ritual rather than war.

The gates opened after Numa’s death and stayed open through the centuries of the Republic, through the Punic Wars, through the civil wars. Livy says they were shut briefly after the First Punic War. Then open again. Always open. The sound of the hinge on the Argiletum was the sound of armies moving.

Augustus closed them three times. He made certain everyone knew it. The closing of the gates of Janus was the supreme claim a ruler could make: that there was no armed enemy anywhere in the Roman world. It was not a religious act exactly, or not only a religious act. It was a political statement rendered in bronze and stone, performed at the shrine of the god who governed every passage between one state and another.

The First Prayer

The deeper point about Janus was simpler than gates or calendars. He held priority. Not power, not dominion - priority. He was the god you acknowledged before you could acknowledge anything else. The Roman who woke on the Calends of January and opened his front door stepped across Janus’s threshold into the new year. The consul who climbed the Capitoline invoked Janus before Jupiter. The priest who performed a sacrifice at any altar in any month poured a few drops of wine for Janus first.

No temple on the Capitoline bore his name. No great festival filled the streets in his honor. He had no mythology in the Greek sense - no loves, no wars, no metamorphoses. He had a function, and his function was first. The Romans, who loved categories and hierarchies and proper sequence, gave him what he required: the opening word.