AD 311

"311 (year)" redirects here. For the year of the pre-Julian Roman calendar, see 311 BC.

Year 311 (CCCXI) was a common year starting on Monday (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 Maximinus (or, less frequently, year 1064 Ab urbe condita). The denomination 311 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.

Millennium:	1st millennium
Centuries:	3rd century 4th century 5th century
Decades:	290s 300s 310s 320s 330s
Years:	308 309 310 311 312 313 314

311 in various calendars

Gregorian calendar	311 CCCXI
Ab urbe condita	1064
Assyrian calendar	5061
Balinese saka calendar	232–233
Bengali calendar	−282
Berber calendar	1261
Buddhist calendar	855
Burmese calendar	−327
Byzantine calendar	5819–5820
Chinese calendar	庚午年 (Metal Horse) 3008 or 2801     — to — 辛未年 (Metal Goat) 3009 or 2802
Coptic calendar	27–28
Discordian calendar	1477
Ethiopian calendar	303–304
Hebrew calendar	4071–4072
Hindu calendars
- Vikram Samvat	367–368
- Shaka Samvat	232–233
- Kali Yuga	3411–3412
Holocene calendar	10311
Iranian calendar	311 BP – 310 BP
Islamic calendar	321 BH – 320 BH
Javanese calendar	191–192
Julian calendar	311 CCCXI
Korean calendar	2644
Minguo calendar	1601 before ROC 民前1601年
Nanakshahi calendar	−1157
Seleucid era	622/623 AG
Thai solar calendar	853–854
Tibetan calendar	阳金马年 (male Iron-Horse) 437 or 56 or −716     — to — 阴金羊年 (female Iron-Goat) 438 or 57 or −715

Domitius Alexander (r. 308–311)

Events

By place

Roman Empire

• April 30 – Emperor Galerius declares on his deathbed religious freedom, and issues his Edict of Serdica, ending the Diocletianic Persecution of Christians in the Eastern part of the Roman Empire.
• May 5 – Galerius dies, age 51, from a gruesome disease, possibly colorectal cancer or Fournier gangrene.
• Maximinus Daza and Licinius divide the Eastern Empire between themselves.
• Maximinus recommences the persecution of Christians, having encouraged his subjects to petition him to do so.
• Fearing an alliance between Licinius and Constantine I, Maximinus forges a secret alliance with Emperor Maxentius.

China

• July 13 – Huai of Jin, emperor of the Jin dynasty, is captured at Luoyang. The capital city is pillaged by Liu Cong, ruler of the Xiongnu state; the invaders slaughter 30,000 citizens.

By topic

Religion

• July 2 – Pope Miltiades succeeds Eusebius as the 32nd pope of Rome.
• The Donatist schism occurs in the African Church.

Deaths

• April 23 – Sima Yue (or Yuanchao), Chinese prince and regent
• May 5
  • Galerius, Roman emperor (b. c.258)
  • Wang Yan, Chinese official and politician (b. 256)
• October 7 – Gou Xi (or Daojiang), Chinese inspector and general
• November 25 – Peter I, patriarch of Alexandria
• December 3 – Diocletian, Roman emperor (b. 244)
• Domitius Alexander, Roman emperor and usuper
• Wang Mi (or Zigu), Chinese general and rebel leader