Ab urbe condita

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Antoninianus of Pacatianus, usurper of Roman emperor Philip in 248. It reads ROMAE AETER[NAE] AN[NO] MIL[LESIMO] ET PRIMO, 'To eternal Rome, in its one thousand and first year.'
Anno ab urbe condita, rubricated and with a decorated initial, from the medieval Chronicle of Saint Pantaleon.

Ab urbe condita (Latin: [ab ˈʊrbɛ ˈkɔndɪtaː] 'from the founding of the City'), or anno urbis conditae (Latin: [ˈan.no̯‿ˈʊrbɪs ˈkɔndɪtae̯]; 'in the year since the city's founding'),[note 1] abbreviated as AUC or AVC, express a date in years since 753 BC, the traditional founding of Rome.[1][2] It is an expression used in antiquity and by classical historians to refer to a given year in Ancient Rome. In reference to the traditional year of the foundation of Rome, the year 1 BC would be written AUC 753, whereas AD 1 would be AUC 754. The foundation of the Roman Empire in 27 BC would be AUC 727.

Usage of the term was more common during the Renaissance, when editors sometimes added AUC to Roman manuscripts they published, giving the false impression that the convention was commonly used in antiquity. In reality, the dominant method of identifying years in Roman times was to name the two consuls who held office that year. In late antiquity, regnal years were also in use, as in Roman Egypt during the Diocletian era after AD 293, and in the Byzantine Empire from AD 537, following a decree by Justinian.


The traditional date for the founding of Rome, 21 April 753 BC, is due to Marcus Terentius Varro (1st century BC). Varro may have used the consular list (with its mistakes) and called the year of the first consuls "ab Urbe condita 245," accepting the 244-year interval from Dionysius of Halicarnassus for the kings after the foundation of Rome. The correctness of this calculation has not been confirmed, but it is still used worldwide.

From the time of Claudius (fl. AD 41 to AD 54) onward, this calculation superseded other contemporary calculations.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 honor of the anniversary of the city, in AD 48, the eight hundredth year from the founding of the city. Hadrian, in AD 121, and Antoninus Pius, in AD 147 and AD 148, held similar celebrations respectively.

In AD 248, 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 "[y]ear 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 Sæculum Novum.

Calendar era

The Anno Domini (AD) year numbering was developed by a monk named Dionysius Exiguus in Rome in AD 525, as a result of his work on calculating the date of Easter. Dionysius did not use the AUC convention, but instead based his calculations on the Diocletian era. This convention had been in use since AD 293, the year of the tetrarchy, as it became impractical to use regnal years of the current emperor.[3] In his Easter table, the year AD 532 was equated with the 248th regnal year of Diocletian. The table counted the years starting from the presumed birth of Christ, rather than the accession of the emperor Diocletian on 20 November AD 284 or, as stated by Dionysius: "sed magis elegimus ab incarnatione Domini nostri Jesu Christi annorum tempora praenotare" ("but rather we choose to name the times of the years from the incarnation of our Lord Jesus Christ").[4] Blackburn and Holford-Strevens review interpretations of Dionysius which place the Incarnation in 2 BC, 1 BC, or AD 1.[5]

The year AD 1 corresponds to AUC 754, based on the epoch of Varro. Thus:

1753 BCFoundation of the Kingdom of Rome
244510 BCOverthrow of the Roman monarchy
259495 BCDeath in exile of King Lucius Tarquinius Superbus
490264 BCPunic Wars
70945 BCFirst year of the Julian calendar
71044 BCThe Assassination of Julius Caesar
72727 BCAugustus became the first Roman emperor, starting the Principate
7531 BCAstronomical Year 0
754AD 1Possible birth date of Jesus, approximated by Dionysius the Little in AD 525 (AUC 1278)
1000AD 2471,000th Anniversary of the City of Rome
1037AD 284Diocletian became Roman emperor, starting the Dominate
1229AD 476Fall of the Western Roman Empire by the armies of Odoacer
1246AD 493Establishment of the Ostrogothic Kingdom
1306AD 553Italy under Eastern Roman control
1507AD 754Foundation of the Papal States
1553AD 800Creation of the Holy Roman Empire
1930AD 1177Papal States became independent from the Holy Roman Empire
2000AD 12472,000th Anniversary of the City of Rome
2206AD 1453Fall of Constantinople
2247AD 1494Italian Wars
2542AD 1789French Revolution
2556AD 1803Napoleonic Wars
2559AD 1806Abolition of the Holy Roman Empire
2601AD 1848Italian unification
2623AD 1870Foundation of the Kingdom of Italy
2682AD 1929Creation of the Sovereign City-State of the Vatican
2699AD 1946Proclamation of the Italian Republic
2711AD 1958Italy joined the European Union.
2736AD 1983Death in exile of King Umberto II
2752AD 1999Italy retired the Lira, and adopted the Euro as its currency.
2774AD 2021Last year
2775AD 2022Current year
2776AD 2023Next year

See also


  1. ^ In literal grammar translation, ab Urbe condita becomes English "from the City founded", and anno Urbis conditae becomes "in the year of the City founded". While this produces odd-sounding English syntax, in Latin this manner of expression is valid, and in particular usual for the word condo ("to found", etc.) in the Classical language; it conveys a tone that is somewhat more archaic and lofty.


  1. ^ "Definition of AB URBE CONDITA". merriam-webster.com. Retrieved 13 July 2021.
  2. ^ "Definition of ANNO URBIS CONDITAE". merriam-webster.com. Retrieved 13 July 2021.
  3. ^ Thomas, J. David. 1971. "On Dating by Regnal Years of Diocletian, Maximian and the Caesars." Chronique d'Égypte 46(91):173–79. doi:10.1484/J.CDE.2.308234.
  4. ^ Migne, Jacques-Paul. 1865. Liber de Paschate (Patrologia Latina 67), p. 481, § XX, note f
  5. ^ Blackburn, B. & Holford-Strevens, L, The Oxford Companion to the Year (Oxford University Press, 2003 corrected reprinting, originally 1999), pp. 778–780.

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