
The Ides of March, or Idus Martias, was a significant day in the Roman calendar even before the murder of Julius Caesar. The month was the first in the Roman calendar and named in honor of the god Mars, the Roman god of war and a guardian of agriculture. As the father of Romulus and Remus, the builders of Rome, he held a significant place in the Roman pantheon.
Ides comes from the Romans' unique numbering system and its basis in a lunar calendar. Instead of numbering each day of the month, they counted the days from three fixed days of the month with Ides occurring on the full moon.
- Nones – 8 days before Ides
- Ides – 15th day of the month in March
- Kalends – 1st day of following month
As the only fixed day in a month, rents and debt payments were usually due on the Ides of each month so people were likely wary of them before March’s Ides were associated with Julius Caesar.
As the first full moon of the year, there were special ceremonies held on the day. While the month was dedicated to Mars, the Ides were dedicated to Jupiter, the king of the gods, and it was custom to hold a procession led by a sacrificial sheep along the Via Sacra to the citadel. Romans would also celebrate the new year with the Feast of Anna Perenna, a goddess of the year. Some sources also place the Mamuralia on the Ides of March. In this ceremony, an elderly man dressed in skins, representing the old year, would have been beaten and driven from the city. By the late Imperial period, the Ides of March were the opening day to a week of festivals celebrating Cybele, the Great Mother, and Attis, her consort.
These days the Ides of March are mostly associated with the assassination of Julius Caesar in 44 BCE during a senate meeting. The most famous portrayal of the historic event is Shakespeare’s The Tragedy of Julius Caesar. From the play we get a few common sayings including “Beware the Ides of March”, “Et tu, Brute?”, "Friends, Romans, countrymen, lend me your ears!", and "Aye, they are come, but they are not gone."
Check out the display on the third floor to learn more about Julius Caesar and Shakespeare’s The Tragedy of Julius Caesar.