The Ides of March (Latin: Idus Martiae) is the name of the date 15 March in the Roman calendar. The term ides was used for the 15th day of the months of March, May, July, and October, and the 13th day of the other eight months. In Roman times, the Ides of March was a festive day dedicated to the god Mars and a military parade was usually held.
In modern times, the term Ides of March is best known as the date that Julius Caesar was assassinated, in 44 BC, the story of which was famously dramatised in William Shakespeare's play Julius Caesar. The term has come to be used as a metaphor for impending doom.
The term id?s (ides) is thought to have originally been the day of the full moon. The Romans considered this an auspicious day in their calendar (see Roman_calendar#Months). The word ides comes from Latin, meaning "half division" (of a month). The word is probably of non-Indoeuropean origin.
Caesar was assassinated on the Ides of March, 44 BC, after declaring himself dictator for life of Rome. According to a near-contemporary biographer, Caesar summoned the Senate to meet in the Theatre of Pompey on the Ides of March. A certain soothsayer warned Caesar to be on his guard against a great peril on the day of the month of March which the Romans call the Ides; and when the day had come and Caesar was on his way to the senate-house, he greeted the seer with a jest and said: "The Ides of March has come," and the seer said to him softly: "Aye, Caesar, but not gone."