"
ab urbe condita" (related to "
anno urbis conditae";
A. U. C.,
AUC,
a.u.c.; also "
anno urbis", short
a.u.) is a
Latin phrase meaning "from the
founding of the City (Rome)", traditionally dated to 753 BC. AUC is a year-numbering system used by some ancient
Roman historians to identify particular Roman years. Renaissance editors sometimes added AUC to Roman manuscripts they published, giving the false impression that the Romans usually numbered their years using the AUC system. The dominant method of identifying Roman years in Roman times was to name the two
consuls who held office that year. The
regnal year of the emperor was also used to identify years, especially in the
Byzantine Empire after 537 when
Justinian required its use.