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Year 268 (CCLXVIII) was a leap year starting on Wednesday (link will display the full calendar) of the Julian calendar. At the time, it was known as the Year of the Consulship of Paternus and Egnatius (or, less frequently, year 1021 Ab urbe condita). The denomination 268 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||1021|
|Balinese saka calendar||189–190|
|Chinese calendar||丁亥年 (Fire Pig)|
2964 or 2904
— to —
戊子年 (Earth Rat)
2965 or 2905
|Coptic calendar||−16 – −15|
|- Vikram Samvat||324–325|
|- Shaka Samvat||189–190|
|- Kali Yuga||3368–3369|
|Iranian calendar||354 BP – 353 BP|
|Islamic calendar||365 BH – 364 BH|
|Minguo calendar||1644 before ROC|
|Seleucid era||579/580 AG|
|Thai solar calendar||810–811|
394 or 13 or −759
— to —
395 or 14 or −758
- September – Battle of Naissus: Emperor Gallienus, aided by Aurelian, defeats a Gothic coalition (50,000 warriors) near Naissus (Niš, modern Serbia).
- Gallienus is killed by his own senior officers at Mediolanum (Milan) while besieging his rival Aureolus, one of the Thirty Tyrants. Aureolus is murdered in turn by the Praetorian guard.
- Marcus Aurelius Claudius is charged, by the Senate, with having murdered Gallienus (it will never be proven). He becomes the new emperor of Rome and will reign as Claudius II.
- Claudius II asks the Senate to spare the lives of Gallienus's family and political supporters. Emperor Gallienus is deified and buried in a family tomb on the Appian Way.
- The Alamanni invade Italy north of the Po River.
- The Visigoths first appear as a distinct people.
- November – Battle of Lake Benacus: A Roman army (35,000 men) under emperor Claudius II defeats the Germanic tribes of the Alamanni along the banks of Lake Garda.
- Victorinus is declared emperor of the Gallic Empire by the legions at Augusta Treverorum (Trier), following the murders of his predecessors. He is recognized by the provinces of Gaul and Britain, but Hispania might have reunited with the Roman Empire.
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- "Saint Dionysius | pope". Encyclopedia Britannica. Retrieved January 5, 2020.
- Wise, Leonard F.; Hansen, Mark Hillary; Egan, E. W. (2005). Kings, Rulers, and Statesmen. Sterling Publishing Company, Inc. p. 142. ISBN 978-1-4027-2592-0.
- Ermatinger, James W. (2018). The Roman Empire: A Historical Encyclopedia [2 volumes]. ABC-CLIO. p. 245. ISBN 978-1-4408-3809-5.