The Ides of March is the fifteenth day of March in the Roman calendar. Ides comes from latin and means half division.
A bad day for one: on the 15th March 44 BCE Julius Caeser was assainated by Marcus Junius Brutus, Gaius Cassius Longinus, Decimus Junius Brutus and several other Roman senators. He was stabbed to death. Beware the Ides of March.
A triumphant day for another: on 15th March 1493 Christopher Columbus returns to Spain after his first journey to the Americas.
An innovative day for technology: on 15th March 1985 the first internet domain name (symbolics.com) is registered.