Year 518 (DXVIII) was a common year starting on Monday (link will display the full calendar) of the Julian calendar. At the time, it was known as the Year of the Consulship of Paulus without colleague (or, less frequently, year 1271 Ab urbe condita). The denomination 518 for this year has been used since the early medieval period, when the Anno Domini calendar era became the prevalent method in Europe for naming years.
|Ab urbe condita||1271|
|Balinese saka calendar||439–440|
|Chinese calendar||丁酉年 (Fire Rooster)|
3214 or 3154
— to —
戊戌年 (Earth Dog)
3215 or 3155
|- Vikram Samvat||574–575|
|- Shaka Samvat||439–440|
|- Kali Yuga||3618–3619|
|Iranian calendar||104 BP – 103 BP|
|Islamic calendar||107 BH – 106 BH|
|Minguo calendar||1394 before ROC|
|Seleucid era||829/830 AG|
|Thai solar calendar||1060–1061|
644 or 263 or −509
— to —
645 or 264 or −508
- July 9 – Emperor Anastasius I dies childless at Constantinople, age 88, after a 27-year reign in which he has abolished the sale of offices, reformed taxation, and perfected the empire's monetary system, but antagonized some with his heretical Monophysite religious policies. He is succeeded by Justin (Flavius Justinus), his comes excubitorum, commander of the palace guard. After his death, he leaves the imperial treasury richer by 23,000,000 solidi or 320,000 pounds of gold.
- Justin I founds the Justinian Dynasty and makes his nephew Flavius Petrus Sabbatius (later Justinian I) his trusted advisor. He becomes the emperor's close confidant and acts possibly as regent. Theocritus, candidate to the throne, is accused of a conspiracy and executed.
- An earthquake destroys the Illyrian (North Macedonian) city of Scupi (later Skopje), in what once was the Roman province of Moesia Superior.
- Jabalah IV becomes the king of the Ghassanids. He invades Palestine, but is defeated by a Byzantine army under general (dux) Romanus.
- September 29 – Severus, patriarch of Antioch, is deposed by a synod for his Monophysitism. Paul the Jew is appointed to replace him.
- July 9 – Anastasius I Dicorus, Byzantine emperor
- July – Theocritus, Byzantine pretender
- Flavian II, patriarch of Antioch
- Gao, Chinese empress of Northern Wei
- Moninne of Killeavy, one of Ireland's early women saints (approximate date)
- Sanghapala, Mon-Khmer monk (b. 506)
- Tonantius Ferreolus, Gallo-Roman senator (approximate date)
- Yu Zhong, official and regent of Northern Wei (b. 452)
- P. Brown, The world of late antiquity, W.W. Norton and Co. 1971 (p. 147)
- Moorhead (1994), p. 21-22, with a reference to Procopius, Secret History 8.3.
- Martindale 1980, p. 489
- Shahîd 1989, p. 121, 125–127; Greatrex & Lieu 2002, p. 51
- Martindale, John R., ed. (1980). The Prosopography of the Later Roman Empire: Volume II, AD 395–527. Cambridge: Cambridge University Press. ISBN 0-521-20159-4.