The Year of Confusion: What Did the Romans Do in January?

The short answer? Nothing — because January didn’t exist.

In the earliest Roman calendar, the new year began in March, and there were only 10 months in a year. According to the BBC, that calendar had just 304 days, with no official months after December. Once the tenth month ended, Romans simply stopped counting — time passed, but it wasn’t organized into weeks or months until March rolled back around. Imagine celebrating New Year’s Day in spring, then living through a two-month time void every winter.

This strange system survived until around the 8th century B.C., when Rome’s second king, Numa Pompilius, decided that the calendar needed more order — or at least something to do during the blank winter months. He added two new months: January and February, extending the year by 51 days and bringing the total to 355 days. This new version mirrored the 354-day lunar calendar used by many ancient cultures, with an extra day added because the Romans believed even numbers were unlucky.

But the fix created new problems. The lunar calendar and the solar year — the cycle of seasons based on Earth’s orbit around the sun — didn’t match. With each passing year, the months drifted farther from the seasons. Farmers, priests, and generals had no reliable way to plan.

To solve this, Roman priests invented a special “leap” month called Mercedonius, which they could insert between February and March when needed to realign the calendar. Unfortunately, it quickly became a tool for political manipulation. Since the priests controlled when Mercedonius was added, they could extend or shorten politicians’ terms or delay elections by declaring a longer or shorter year.

By the time Julius Caesar came to power, the calendar was in chaos. The months no longer matched the seasons at all. In response, Caesar introduced a bold fix: a total overhaul of time itself.

In 46 B.C., Caesar added two extra months to the year, creating a 445-day calendar year — the longest in Roman history. Historians call it the “Year of Confusion.” After this reset, Caesar abolished Mercedonius for good and adopted a new 12-month calendar based on the sun — what we now call the Julian calendar.

But the Julian system still wasn’t perfect. The solar year is 365.24 days long, so over time, even the Julian calendar began to drift. That’s where Emperor Augustus stepped in. A few decades later, he introduced the leap year, adding one day to February every four years. This small but powerful change helped keep the calendar aligned with the seasons for centuries.

So while January may seem dull and dreary, at least it exists — and you don’t have to worry about falling into a rogue mystery month like Mercedonius. You can thank a Roman king, two emperors, and several very confused centuries for giving us the calendar we now use today.