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"''ab urbe condita''" (related to "''anno urbis conditae''"; A. U. C., AUC, a.u.c.; also "''anno urbis''", short a.u.〔Dio uses "a.u." in his ''Roman History''〕) is a Latin phrase meaning "from the founding of the City (Rome)",〔Literally translated as "From the city having been founded".〕 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. Examples of continuous numbering include counting by regnal year, principally found in the writings of German authors, for example Mommsen's ''History of Rome'', and (most ubiquitously) in the Anno Domini year-numbering system. ==Significance== The traditional date for the founding of Rome of 21 April 753 BC, was initiated by 1st century BC scholar Marcus Terentius Varro. Varro may have used the consular list with its mistakes, and called the year of the first consuls "245 ''ab urbe condita''", accepting the 244-year interval from Dionysius of Halicarnassus for the kings after the foundation of Rome. The correctness of Varro's calculation has not been proven scientifically but is still used worldwide. From Emperor Claudius (reigned 41–54 AD) onwards, Varro's calculation superseded other contemporary calculations. Celebrating the anniversary of the city became part of imperial propaganda. Claudius was the first to hold magnificent celebrations in honour of the city's anniversary, in 48 AD, 800 years after the founding of the city. Hadrian and Antoninus Pius held similar celebrations, in 121 AD and 147/148 AD respectively. During 248 AD, Philip the Arab celebrated Rome's first millennium, together with Ludi saeculares for Rome's alleged tenth saeculum. Coins from his reign commemorate the celebrations. A coin by a contender for the imperial throne, Pacatianus, explicitly states "Year one thousand and first", which is an indication that the citizens of the Empire had a sense of the beginning of a new era, a ''Saeculum Novum''. When the Roman Empire turned Christian during the following century, this imagery came to be used in a more metaphysical sense, and removed legal impediments to the development and public use of the ''Anno Domini'' dating system, which came into general use during the reign of Charlemagne. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Ab urbe condita」の詳細全文を読む スポンサード リンク
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