Who Made The Modern Calendar. Learn about the history of calendars from ancient to modern, different calendars around the globe, and religious calendars. But before julius caesar, the roman leaders would think nothing of changing the calendar so they could collect taxes earlier, keep themselves in office, or—if they felt like it—add a month.

Each name and number from our calendar is steeped in tradition and. The solar calendar of ancient rome gives rise to our modern western calendar.