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Llywelyn the Great, who in 1231 launched a campaign against Normans in Wales.
This article is about the year 1231. For the number, see 1231 (number).
Millennium: 2nd millennium
Centuries: 12th century13th century14th century
Decades: 1200s  1210s  1220s  – 1230s –  1240s  1250s  1260s
Years: 1228 1229 123012311232 1233 1234
1231 by topic
State leadersSovereign states
Birth and death categories
Establishments and disestablishments categories
Art and literature
1231 in poetry
1231 in other calendars
Gregorian calendar 1231
Ab urbe condita 1984
Armenian calendar 680
Assyrian calendar 5981
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(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
Javanese calendar 1140–1141
Julian calendar 1231
Korean calendar 3564
Minguo calendar 681 before ROC
Nanakshahi calendar −237
Thai solar calendar 1773–1774

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


By area[edit]


  • April 9 – After a bizarre weather phenomena of yellowish clouds and dust chokes the air around Hangzhou, Song Dynasty, China, obscuring the sky and sun, a fire breaks out at night in the southeast of the city, which continues into the next day. Fighting the flames is difficult due to limited visibility. When the fires are extinguished, it is discovered that an entire district of some 10,000 houses in the southeast of the city were consumed by the flames.
  • Mongol troops cross the Yalu River into Korea, then under the Goryeo Kingdom.


By topic[edit]





  1. ^ Peter Linehan (1999). "Chapter 21: Castile, Portugal and Navarre". In David Abulafia. The New Cambridge Medieval History c.1198-c.1300. Cambridge: Cambridge University Press. pp. 668–673. ISBN 0-521-36289-X.