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Caesar changed it to start on January 1st because the Roman consuls took office then on that day.

• artursapek 3y ago
  He also named July after himself!
  • ajmurmann 3y ago
    It's so weird to me that they assassinated him, but didn't rename the month back. Imagine Trump had renamed June to "Trump", he then gets impeached and 2000 years later the month is still called Trump.
    • artursapek 3y ago
      Probably not an easy thing to change