Template:Boeing Year disambiguation
| Centuries: | 2nd century · 3rd century · 4th century |
| Decades: | 190s 200s 210s 220s 230s 240s 250s |
| Years: | 218 219 220 221 222 223 224 |
| Gregorian calendar | 221 CCXXI |
| Ab urbe condita | 974 |
| Assyrian calendar | 4971 |
| Balinese saka calendar | 142–143 |
| Bengali calendar | −373 – −372 |
| Berber calendar | 1171 |
| Buddhist calendar | 765 |
| Burmese calendar | −417 |
| Byzantine calendar | 5729–5730 |
| Chinese calendar | 庚子年 (Metal Rat) 2918 or 2711 — to — 辛丑年 (Metal Ox) 2919 or 2712 |
| Coptic calendar | −63 – −62 |
| Discordian calendar | 1387 |
| Ethiopian calendar | 213–214 |
| Hebrew calendar | 3981–3982 |
| Hindu calendars | |
| - Vikram Samvat | 277–278 |
| - Shaka Samvat | 142–143 |
| - Kali Yuga | 3321–3322 |
| Holocene calendar | 10221 |
| Iranian calendar | 401 BP – 400 BP |
| Islamic calendar | 413 BH – 412 BH |
| Javanese calendar | 99–100 |
| Julian calendar | 221 CCXXI |
| Korean calendar | 2554 |
| Minguo calendar | 1691 before ROC 民前1691年 |
| Nanakshahi calendar | −1247 |
| Seleucid era | 532/533 AG |
| Thai solar calendar | 763–764 |
| Tibetan calendar | 阳金鼠年 (male Iron-Rat) 347 or −34 or −806 — to — 阴金牛年 (female Iron-Ox) 348 or −33 or −805 |
Events
By Place
Roman Empire
- June 26 - Emperor Elagabalus adopts Alexander Severus as his heir.
Asia
- Liu Bei, Chinese warlord and descendant of the royal family of the Han Dynasty, proclaims himself emperor. The Shu Han Kingdom was established.