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|264 by topic|
|Ab urbe condita||1017|
|Balinese saka calendar||185–186|
|Chinese calendar||癸未年 (Water Goat)|
2960 or 2900
— to —
甲申年 (Wood Monkey)
2961 or 2901
|Coptic calendar||−20 – −19|
|- Vikram Samvat||320–321|
|- Shaka Samvat||185–186|
|- Kali Yuga||3364–3365|
|Iranian calendar||358 BP – 357 BP|
|Islamic calendar||369 BH – 368 BH|
|Minguo calendar||1648 before ROC|
|Seleucid era||575/576 AG|
|Thai solar calendar||806–807|
390 or 9 or −763
— to —
391 or 10 or −762
Year 264 (CCLXIV) was a leap year starting on Friday (link will display the full calendar) of the Julian calendar. At the time, it was known as the Year of the Consulship of Gallienus and Saturninus (or, less frequently, year 1017 Ab urbe condita). The denomination 264 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.
- Zhong Hui's Rebellion is quelled.
- Sima Zhao, regent of the Cao Wei state, styles himself the King of Jin, the penultimate step before usurpation.
- Sun Hao succeeds Sun Xiu as emperor of the Chinese state of Eastern Wu.
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- February – Empress Guo, Chinese empress of the Cao Wei state
- March 3 – Jiang Wei, Chinese general of the Shu Han state (b. 202)
- March 3 – Zhong Hui, Chinese general of the Cao Wei state (b. 225)
- March – Deng Ai, Chinese general of the Cao Wei state (b. 197)
- September 3 – Sun Xiu, Chinese emperor of the Eastern Wu state (b. 235)