44BC – Julius Caesar the dictator of the Roman Republic, was stabbed to death by Marcus Junius Brutus, Gaius Cassius Longinus, Decimus Junius Brutus and several other Roman senators on the Ides of March.
1493 – Christopher Columbus returned to Spain on the 15th March 1493, after his first trip to the Americas.
1820 – Maine became the 23rd U.S. state on the 15th March 1820.