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|308 by topic|
|Ab urbe condita||1061|
|Balinese saka calendar||229–230|
|Chinese calendar||丁卯年 (Fire Rabbit)
3004 or 2944
— to —
戊辰年 (Earth Dragon)
3005 or 2945
|- Vikram Samvat||364–365|
|- Shaka Samvat||229–230|
|- Kali Yuga||3408–3409|
|Iranian calendar||314 BP – 313 BP|
|Islamic calendar||324 BH – 323 BH|
|Minguo calendar||1604 before ROC
|Seleucid era||619/620 AG|
|Thai solar calendar||850–851|
434 or 53 or −719
— to —
435 or 54 or −718
|Wikimedia Commons has media related to 308.|
Year 308 (CCCVIII) was a leap year starting on Thursday (link will display the full calendar) of the Julian calendar. At the time, it was known as the Year of the Consulship of Valerius and Valerius (or, less frequently, year 1061 Ab urbe condita). The denomination 308 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.
- April – History of Trier: Roman usurper Maxentius banishes his father, Maximian, who flees to the court of Constantine the Great in modern Trier.
- November 11 – The Congress of Carnuntum: Attempting to keep peace within the Roman Empire, the leaders of the Tetrarchy declare Maxentius a public enemy and Licinius is proclaimed Augustus, while rival contender Constantine I is declared Caesar of Britain and Gaul.
- Under Constantine I, the Romans defeat the Germans along the Rhine frontier.
- Domitius Alexander is acclaimed emperor (against Maxentius) in Carthage; the African provinces come under his rule. This is a dangerous situation, because Rome depends on the African grain supply.
- Construction of the Basilica of Maxentius (Basilica Nova), the largest building in the Roman Forum, is begun.
- The Han Zhao Dynasty is established in northern China, marking the official inception of the long lasting Uprising of the Five Barbarians.
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