COLIGNY CALENDAR: THE 1,800-YEAR-OLD LUNISOLAR CALENDAR BANNED BY THE ROMANS
In 1897, the Gaulish Coligny Calendar was discovered in Coligny, Ain, France. The bronze calendar was found broken into 73 pieces, which together form a 5 foot wide, 3.5 foot high bronze tablet. When assembled, it displays a lunisolar calendar, which follows both moon phases and the time of solar year. It is believed that the calendar, dating back to the 2nd century AD, had been banned by the Romans as it indicated druidic practices. The calendar can now be found at the Gallo-Roman Museum of Lyon.