|Centuries:||2nd century – 3rd century – 4th century|
|Decades:||240s 250s 260s – 270s – 280s 290s 300s|
|Years:||273 274 275 – 276 – 277 278 279|
|276 by topic|
|State leaders – Sovereign states|
|Birth and death categories|
|Births – Deaths|
|Establishment and disestablishment categories|
|Establishments – Disestablishments|
|Ab urbe condita||1029|
|Bahá'í calendar||−1568 – −1567|
|English Regnal year||N/A|
|Chinese calendar||乙未年 (Wood Goat)
2972 or 2912
— to —
丙申年 (Fire Monkey)
2973 or 2913
|Coptic calendar||−8 – −7|
|- Vikram Samvat||332–333|
|- Shaka Samvat||198–199|
|- Kali Yuga||3377–3378|
|Igbo calendar||−724 – −723|
|Iranian calendar||346 BP – 345 BP|
|Islamic calendar||357 BH – 356 BH|
|Minguo calendar||1636 before ROC
|Thai solar calendar||819|
|Wikimedia Commons has media related to 276.|
Year 276 (CCLXXVI) was a leap year starting on Saturday (link will display the full calendar) of the Julian calendar. At the time, it was known as the Year of the Consulship of Tacitus and Aemilianus (or, less frequently, year 1029 Ab urbe condita). The denomination 276 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.
- Emperor Tacitus doubled the silver content of the aurelianianus and halved its tariffing to 2.5 d.c. carry the value marks X.I.
- Marcus Annius Florianus defeats the Goths and Alans who have invaded Asia Minor. Tacitus dies of illness or is murdered at Tyana in Cappadocia.
- Florianus becomes Roman Emperor; he breaks off his campaign against the Heruli and marches from the Bosporus with support from the Roman legions in Britain, Gaul, Spain and Italy to fight an indecisive battle with Marcus Aurelius Probus in Cilicia.
- Florianus holds power for some weeks, but is assassinated by his own troops near Tarsus (Turkey). Probus, age 44, is proclaimed new Emperor of Rome.
- Probus appoints Marcus Aurelius Carus to Prefect of the Praetorian Guard, he returns the aurelianianus to the standard and official tariffing of Aurelian.
- King Bahram I of Persia dies after a 3-year reign in which the Zoroastrian priests at Ctesiphon (Iran) put pressure on him to persecute Buddhists, Christians and Manichaeans. He is succeeded by his son Bahram II.
- Reign of Mahasena in Ceylon. Orthodox and unpopular, he tries to introduce Mahayana Buddhism to the country.
- Mani, a sage from Persia, dies at Gundeshapur after 30 years of preaching his "heresy" at the court of the late Sassanian king Shapur I and on long journeys to Khorasan, India and China. He is executed or allowed to die in prison, and claims to be a prophet of God. Mani combines Zoroastrian dualism with Christian theology and his disciples gain wide support for Manichaeism despite opposition from Byzantine and Roman Emperors.
- Gregory the Elder, bishop of Nazianzus (approximate date)
- Guo Pu, Chinese writer (d. 324)
- Jin Yuandi, emperor of the Jin Dynasty (d. 323)
- Wang Dao, statesman of the Jin Dynasty (d. 339)
- Bahram I, king of Persia
- Mani, prophet and founder of Manichaeism
- Marcus Annius Florianus, Roman Emperor
- Marcus Claudius Tacitus, Roman Emperor