1231
year
1231 (MCCXXXI) was a common year starting on Wednesday of the Julian calendar, the 1231st year of the Common Era (CE) and Anno Domini (AD) designations, the 231st year of the 2nd millennium, the 31st year of the 13th century, and the 2nd year of the 1230s decade. As of the start of 1231, the Gregorian calendar was 7 days ahead of the Julian calendar, which was the dominant calendar of the time.
| Millennium: | 2nd millennium |
|---|---|
| Centuries: | 12th century – 13th century – 14th century |
| Decades: | 1200s 1210s 1220s – 1230s – 1240s 1250s 1260s |
| Years: | 1228 1229 1230 – 1231 – 1232 1233 1234 |
| Gregorian calendar | 1231 MCCXXXI |
| Ab urbe condita | 1984 |
| Armenian calendar | 680 ԹՎ ՈՁ |
| Assyrian calendar | 5981 |
| Balinese saka calendar | 1152–1153 |
| Bengali calendar | 638 |
| Berber calendar | 2181 |
| English Regnal year | 15 Hen. 3 – 16 Hen. 3 |
| Buddhist calendar | 1775 |
| Burmese calendar | 593 |
| Byzantine calendar | 6739–6740 |
| Chinese calendar | 庚寅年 (Metal Tiger) 3927 or 3867 — to — 辛卯年 (Metal Rabbit) 3928 or 3868 |
| Coptic calendar | 947–948 |
| Discordian calendar | 2397 |
| Ethiopian calendar | 1223–1224 |
| Hebrew calendar | 4991–4992 |
| Hindu calendars | |
| - Vikram Samvat | 1287–1288 |
| - Shaka Samvat | 1152–1153 |
| - Kali Yuga | 4331–4332 |
| Holocene calendar | 11231 |
| Igbo calendar | 231–232 |
| Iranian calendar | 609–610 |
| Islamic calendar | 628–629 |
| Japanese calendar | Kangi 3 (寛喜３年) |
| Javanese calendar | 1140–1141 |
| Julian calendar | 1231 MCCXXXI |
| Korean calendar | 3564 |
| Minguo calendar | 681 before ROC 民前681年 |
| Nanakshahi calendar | −237 |
| Thai solar calendar | 1773–1774 |
| Tibetan calendar | 阳金虎年 (male Iron-Tiger) 1357 or 976 or 204 — to — 阴金兔年 (female Iron-Rabbit) 1358 or 977 or 205 |
Births
change- March 17 – Emperor Shijō of Japan (died 1242)
- Guo Shoujing, Chinese astronomer and mathematician
- John de Warenne, 7th Earl of Surrey (died 1304)
- Roger Mortimer, 1st Baron Wigmore (died 1282)
Deaths
change- April 6 – William Marshal, 2nd Earl of Pembroke
- June 13 – Anthony of Padua, Portuguese saint (born 1195)
- November 6 – Emperor Tsuchimikado of Japan (born 1196)
- November 17 – Elisabeth of Hungary, daughter of Andrew II of Hungary and saint (born 1207)
- Abd-el-latif, Arab physician and traveller