The Fasti Antiates maiores are a painted wall-calendar from the Late Roman Republic, the oldest archaeologically attested local Roman calendar and the only such calendar known from before the Julian calendar reforms. It was created between 67 and 55 BC and discovered in 1915 at Anzio, the ancient Antium, in a crypt next to the coast and is now located in the Palazzo Massimo alle Terme in Rome, part of the Museo Nazionale Romano.
Anzio lies about 58 km south of Rome in the region of Latium. In the sixth century, at the latest, the Latins inhabited the region of Latium, remaining independent of Rome until 338 BC. Rome first took control of the region in the Latin War after the Battle of Trifanum and incorporated it into the incipient Roman empire.
The Fasti Antiates maiores consist of two fragments of the thirteen month calendar and the List of Roman Consuls. The 1.16 m high and 2.5 m wide calendar contains the leap month Mensis Intercalaris in addition to the twelve months.
The list of consuls was the same height as the calendar, but 1.36 m wide. The names of the consuls span the period from 164 BC to 84 BC. According to the restoration of the lacunae at both ends, the list originally extended from 173 BC to 67 BC.
The calendar takes the form of a table with thirteen columns, each of which is a month labelled with an abbreviation of its name. Still legible are the following: IAN for Ianuarius (January), FEB for Februarius (February), APR for Aprilis (April), IVN for Iunius (June), and SEP for September.