assembled during the late republic by Marcus Terentius Varro and later used by the fasti Capitolini, which likely - in the earlier period - runs four years behind the actual dates (i.e. Varronian year 344 corresponds to real year 340 BC).

The simplest way for the Romans to have inferred the age of their republic would have been to look at the list of consuls, of which two were elected every year, and count the number of consular pairs