Coligny calendar

The Coligny calendar is a peg calendar (or parapegma) made in Roman Gaul in ca. the 2nd century AD, giving a five-year cycle of a lunisolar calendar with intercalary months. It is the most important evidence for the reconstruction of an ancient Celtic calendar. It is written in Latin inscriptional capitals and is in the Gaulish language. The restored tablet contains sixteen vertical columns, with 62 months distributed over five years.

It was found in 1897 in France, in Coligny, Ain département (46°23′N 5°21′E / 46.383°N 5.350°E / 46.383; 5.350, near Lyon), along with the head of a bronze statue of a youthful male figure. It is now held at the Gallo-Roman Museum of Lyon. It was engraved on a bronze tablet, preserved in 73 fragments, that was originally 1.48 m wide by 0.9 m tall (5 ft wide by 3 ¹⁄₂ ft tall). Based on the style of lettering and the accompanying objects, it probably dates to the end of the 2nd century AD.

A similar calendar found nearby at Villards d'Heria (46°25′N 5°44′E / 46.417°N 5.733°E / 46.417; 5.733) is preserved in only eight small fragments. It is now preserved in the Musée d'Archéologie du Jura at Lons-le-Saunier.