It was a message to Julius Caesar warning him of his death. T<span>he Ides of March didn't signify anything special in itself - this was just the usual way of saying "March 15th". The notion of the Ides being a dangerous date was purely an invention of Shakespeare's; each month has an Ides (often the 15th) and this date wasn't significant in being associated with death prior to 1601.</span>
