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|263 by topic|
|Ab urbe condita||1016|
|Balinese saka calendar||184–185|
|Chinese calendar||壬午年 (Water Horse)|
2959 or 2899
— to —
癸未年 (Water Goat)
2960 or 2900
|Coptic calendar||−21 – −20|
|- Vikram Samvat||319–320|
|- Shaka Samvat||184–185|
|- Kali Yuga||3363–3364|
|Iranian calendar||359 BP – 358 BP|
|Islamic calendar||370 BH – 369 BH|
|Minguo calendar||1649 before ROC|
|Seleucid era||574/575 AG|
|Thai solar calendar||805–806|
389 or 8 or −764
— to —
390 or 9 or −763
Year 263 (CCLXIII) was a common 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 Albinus and Dexter (or, less frequently, year 1016 Ab urbe condita). The denomination 263 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.
- King Odenathus of Palmyra declares himself ruler of the area west of the River Euphrates and is declared Dux Orientalis by the Roman emperor Gallienus.
- Conquest of Shu by Wei: The Chinese state of Cao Wei conquers Shu Han, one of its two rival states.
- Sima Zhao, regent of the Cao Wei state, receives and accepts the nine bestowments, state chancellorship, and the title Duke of Jin from Cao Huan.
Arts and sciences
- Chinese mathematician Liu Hui writes a commentary on The Nine Chapters on the Mathematical Art, describing what will later be called Gaussian elimination, computing pi, etc.
- Liu Chen, Chinese prince of the Shu Han state
- Ruan Ji, Chinese poet and musician (b. 210)
- Zhuge Zhan, Chinese general of the Shu Han state (b. 227)