| Millennium: | 2nd Millennium |
|---|---|
| Centuries: | 12th cent. – 13th cent. – 14th cent. |
| Decades: | 1190s 1200s 1210s – 1220s – 1230s 1240s 1250s |
| Years: | 1218 1219 1220 – 1221 – 1222 1223 1224 |
| Gregorian calendar | 1221 MCCXXI |
| Ab urbe condita | 1974 |
| Armenian calendar | 670 ԹՎ ՈՀ |
| Assyrian calendar | 5971 |
| Bengali calendar | 628 |
| Berber calendar | 2171 |
| English Regnal year | 5 Hen. 3 – 6 Hen. 3 |
| Buddhist calendar | 1765 |
| Burmese calendar | 583 |
| Byzantine calendar | 6729–6730 |
| Chinese calendar | 庚辰年 (Metal Dragon) 3917 or 3857 — to — 辛巳年 (Metal Snake) 3918 or 3858 |
| Coptic calendar | 937–938 |
| Discordian calendar | 2387 |
| Ethiopian calendar | 1213–1214 |
| Hebrew calendar | 4981–4982 |
| Hindu calendars | |
| - Vikram Samvat | 1277–1278 |
| - Shaka Samvat | 1142–1143 |
| - Kali Yuga | 4321–4322 |
| Holocene calendar | 11221 |
| Igbo calendar | 221–222 |
| Iranian calendar | 599–600 |
| Islamic calendar | 617–618 |
| Japanese calendar | Jōkyū 3 (承久３年) |
| Javanese calendar | 1129–1130 |
| Julian calendar | 1221 MCCXXI |
| Korean calendar | 3554 |
| Minguo calendar | 691 before ROC 民前691年 |
| Nanakshahi calendar | −247 |
| Thai solar calendar | 1763–1764 |
The year 1221 BC