On the Ides of March, Julius Caesar was assassinated by a group of senators who stabbed him 23 times, fearing his growing authority in Rome. The Romans counted dates based on three points in the month: the Kalends (1st), the Nones (7th/9th), and the Ides (13th/15th). On the Ides of March, the senators killed Caesar out of fears that his ambition would make him king, threatening Rome's republican system of government.