1231

Millennium: 2nd millennium
Centuries:
Decades:
Years:
1231 in various calendars
Gregorian calendar1231
MCCXXXI
Ab urbe condita1984
Armenian calendar680
ԹՎ ՈՁ
Assyrian calendar5981
Balinese saka calendar1152–1153
Bengali calendar638
Berber calendar2181
English Regnal year15 Hen. 3 – 16 Hen. 3
Buddhist calendar1775
Burmese calendar593
Byzantine calendar6739–6740
Chinese calendar庚寅年 (Metal Tiger)
3928 or 3721
    — to —
辛卯年 (Metal Rabbit)
3929 or 3722
Coptic calendar947–948
Discordian calendar2397
Ethiopian calendar1223–1224
Hebrew calendar4991–4992
Hindu calendars
 - Vikram Samvat1287–1288
 - Shaka Samvat1152–1153
 - Kali Yuga4331–4332
Holocene calendar11231
Igbo calendar231–232
Iranian calendar609–610
Islamic calendar628–629
Japanese calendarKangi 3
(寛喜3年)
Javanese calendar1140–1141
Julian calendar1231
MCCXXXI
Korean calendar3564
Minguo calendar681 before ROC
民前681年
Nanakshahi calendar−237
Thai solar calendar1773–1774
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
Simon de Montfort (c. 1208–1265)

Year 1231 (MCCXXXI) was a common year starting on Wednesday (link will display the full calendar) of the Julian calendar.