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Year 254 (CCLIV) was a common year starting on Sunday (link will display the full calendar) of the Julian calendar. At the time, it was known as the Year of the Consulship of Valerianus and Gallienus (or, less frequently, year 1007 Ab urbe condita). The denomination 254 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||1007|
|Balinese saka calendar||175–176|
|Chinese calendar||癸酉年 (Water Rooster)|
2950 or 2890
— to —
甲戌年 (Wood Dog)
2951 or 2891
|Coptic calendar||−30 – −29|
|- Vikram Samvat||310–311|
|- Shaka Samvat||175–176|
|- Kali Yuga||3354–3355|
|Iranian calendar||368 BP – 367 BP|
|Islamic calendar||379 BH – 378 BH|
|Minguo calendar||1658 before ROC|
|Seleucid era||565/566 AG|
|Thai solar calendar||796–797|
380 or −1 or −773
— to —
381 or 0 or −772
- Publius Licinius Valerianus Augustus and Publius Licinius Egnatius Gallienus become Roman Consuls.
- The Roman Empire is threatened by several peoples on their borders: the Germanic confederations, such as the Franks on the Middle Rhine, the Alemanni on the upper Rhine and Danube, and the Marcomanni facing the provinces at Noricum and Raetia. On land the confederation of Goths threaten the lower Danube provinces and on the sea they threaten the shores of Thracia, Bithynia et Pontus, and Cappadocia. In the eastern provinces, the Sassanid Persians had the previous year defeated a Roman field army at Barballisos and afterwards plundered the defenseless provinces. This was the period of time which today is called the crisis of the third century.
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