Coligny 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 3½ 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.