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Millennium: 1st millennium
321 in various calendars
Gregorian calendar 321
Ab urbe condita 1074
Assyrian calendar 5071
Balinese saka calendar 242–243
Bengali calendar −272
Berber calendar 1271
Buddhist calendar 865
Burmese calendar −317
Byzantine calendar 5829–5830
Chinese calendar 庚辰(Metal Dragon)
3017 or 2957
    — to —
辛巳年 (Metal Snake)
3018 or 2958
Coptic calendar 37–38
Discordian calendar 1487
Ethiopian calendar 313–314
Hebrew calendar 4081–4082
Hindu calendars
 - Vikram Samvat 377–378
 - Shaka Samvat 242–243
 - Kali Yuga 3421–3422
Holocene calendar 10321
Iranian calendar 301 BP – 300 BP
Islamic calendar 310 BH – 309 BH
Javanese calendar 202–203
Julian calendar 321
Korean calendar 2654
Minguo calendar 1591 before ROC
Nanakshahi calendar −1147
Seleucid era 632/633 AG
Thai solar calendar 863–864
Tibetan calendar 阳金龙年
(male Iron-Dragon)
447 or 66 or −706
    — to —
(female Iron-Snake)
448 or 67 or −705
Disc of the Roman sun god Sol Invictus.

Year 321 (CCCXXI) 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 Crispus and Constantinus (or, less frequently, year 1074 Ab urbe condita). The denomination 321 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.


By topic

Roman Empire

  • Emperor Constantine I expels the Goths from the Danube frontier and repairs Trajan's Bridge. He leads an expedition into the old province Dacia (modern Romania) and makes peace with the barbarians.
  • March 7 - Constantine I signs legislation directing urban residents to refrain from work, and businesses to be closed, on the "venerable day of the Sun". An exception is made for agriculture.


By topic

Arts and sciences

Food and drink

  • Constantine I assigns convicts to grind Rome's flour, in a move to hold back the rising price of food in an empire whose population has shrunk as a result of plague (see 309 AD).





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