The Ides are dates in the ancient Roman calendar, most famously the Ides of March (March 15), known today because that’s when Julius Caesar was assassinated.

Quick Scoop: What are “Ides”?

In the Roman calendar, each month was organized around three key reference points: the Kalends , the Nones , and the Ides. The Ides usually fell in the middle of the month and were used as anchor days from which other dates were counted.

  • In most months, the Ides fell on the 13th.
  • In March, May, July, and October , the Ides fell on the 15th.
  • Dates were counted backward from these points (e.g., “two days before the Ides of March”).

Why is “the Ides of March” famous?

The phrase “Beware the Ides of March” comes from William Shakespeare’s play Julius Caesar , where a soothsayer warns Caesar about the 15th of March. Historically, Julius Caesar was indeed assassinated on March 15, 44 BCE , and since then the Ides of March has been associated with:

  • Sudden political betrayal
  • A turning point or moment of doom
  • Symbolic warnings about power and downfall

Today, people sometimes use “the Ides” (especially “Ides of March”) in news, forums, and social media as a dramatic or joking way to refer to mid-March or to an ominous deadline or decision point. TL;DR:
The Ides are the mid-month days in the Roman calendar (usually the 13th, but the 15th in some months like March), and the Ides of March became legendary as the date of Julius Caesar’s assassination and a symbol of warning and betrayal.