Coligny calendar
The Coligny calendar is a celtic calendar from roman times. It was found near Lyon in 1897. It was made of bronze, but today, only fragments remain. Studies found that these fragments made up a gallic calendar, which had been created for a period of five years. The calendar indicates both the time of the solar year and the phase of the moon, which is generally called a lunisolar calendar.
It was engraved on a bronze tablet, preserved in 73 fragments, that originally was 1.48 m wide and 0.9 m high (Lambert p. 111) or approximately wide by 3 1/2 feet in height. Based on the style of lettering and the accompanying objects, it probably dates to the end of the 2nd century AD. It is written in Latin inscriptional capitals and is in the Gaulish language (Duval & Pinault). The restored tablet contains sixteen vertical columns, with 62 months distributed over five years.
The French archaeologist, J. Monard, speculated that it was recorded by druids wishing to preserve their tradition of timekeeping in a time when the Julian calendar was being imposed throughout the Roman Empire. However, the general form of the calendar suggests the public peg calendars (or parapegmata) found throughout the Greek and Roman world (Lehoux pp. 63-65).
A similar calendar found nearby at Villards d'Heria () is only preserved in eight small fragments. It is now preserved in the Musee d'Archeologie du Jura at Lons-le-Saunier.
References
Celtic peoples
Calendars