Now used as a metaphor for impending doom, the “Ides of March” was originally simply a name for March 15th. In the ancient Roman calendar, the term “ides” referred to the 15th day of the months of March, May, July, and October and the 13th of all other months. The Ides of March was a festive day dedicated to the god of Mars and often marked with a military parade. However, when Julius Caesar was assassinated on that day in 44 BCE, the phrase took on an entirely new meaning. Who killed Caesar? Discuss
Source: The Free Dictionary