This involved naming both consules ordinarii who had taken up this office on January 2 of the relevant civil year.
Sometimes one or both consuls might not be appointed until November or December of the previous year, and news of the appointment may not have reached parts of the Roman empire for several months into the current year; thus we find the occasional inscription where the year is defined as "after the consulate" of a pair of consuls.
Astronomers have identified this eclipse as one that took place on 15 June, 763 BC, which has allowed absolute dates of 892 to 648 BC to be assigned to that sequence of eponyms.
It was rarely used in the Roman calendar and in the early Julian calendar – naming the two consuls that held office in a particular year was dominant.
AD 2017 is thus approximately the same as AUC 2770 (2017 753).
The Spanish era counted the years from 38 BC, probably the date of a new tax imposed by the Roman Republic on the subdued population of Iberia.
The date marked the establishment of Roman rule in Spain and was used in official documents in Portugal, Aragon, Valencia, and in Castile, into the 14th century.A calendar era is the year numbering system used by a calendar.