321
| Millennium: | 1st millennium |
|---|---|
| Centuries: | |
| Decades: | |
| Years: |
| 321 by topic |
|---|
| Leaders |
| Categories |
| Gregorian calendar | 321 CCCXXI |
| Ab urbe condita | 1074 |
| Assyrian calendar | 5071 |
| Balinese saka calendar | 242–243 |
| Bengali calendar | −273 – −272 |
| Berber calendar | 1271 |
| Buddhist calendar | 865 |
| Burmese calendar | −317 |
| Byzantine calendar | 5829–5830 |
| Chinese calendar | 庚辰年 (Metal Dragon) 3018 or 2811 — to — 辛巳年 (Metal Snake) 3019 or 2812 |
| 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 CCCXXI |
| Korean calendar | 2654 |
| Minguo calendar | 1591 before ROC 民前1591年 |
| 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 — 阴金蛇年 (female Iron-Snake) 448 or 67 or −705 |
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.
Events
By topic
Roman Empire
- March 7 – Edict of Constantine I: The dies Solis Invicti (Sunday) is proclaimed as the day of rest, trade is forbidden and agriculture is allowed.[1] Jews continue to observe the Sabbath on Saturday, and Constantine himself continues to worship the ancient Roman sun god, Apollo, despite his acceptance of Christianity.
- Emperor Constantine I expels the Goths from the Danube frontier and repairs Trajan's Bridge. He leads a expedition into the old province Dacia (modern Romania) and makes peace with the barbarians.
Asia
- Tuoba Heru launched a coup d'état against his cousin Tuoba Yulü and becomes the new Prince of Dai.
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).
Religion
- The Roman Catholic church is allowed to hold property.
- A synod in Alexandria condemns Arianism.
Births
- Du Lingyang, empress of the Jin Dynasty (d. 341)
- Jin Chengdi, emperor of the Jin Dynasty (d. 342)
- Valentinian I, Roman Emperor (d. 375)
Deaths
- Tuoba Yulü, prince of the Tuoba Dai