<P> The Ides of March (Latin: Idus Martiae, Late Latin: Idus Martii) is a day on the Roman calendar that corresponds to 15 March . It was marked by several religious observances and was notable for the Romans as a deadline for settling debts . In 44 BC, it became notorious as the date of the assassination of Julius Caesar which made the Ides of March a turning point in Roman history . </P> <P> The Romans did not number days of a month from the first to the last day . Instead, they counted back from three fixed points of the month: the Nones (5th or 7th, depending on the length of the month), the Ides (13th or 15th), and the Kalends (1st of the following month). The Ides occurred near the midpoint, on the 13th for most months, but on the 15th for March, May, July, and October . The Ides were supposed to be determined by the full moon, reflecting the lunar origin of the Roman calendar . On the earliest calendar, the Ides of March would have been the first full moon of the new year . </P>

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