831

Millennium: 1st millennium
Centuries:
Decades:
Years:
831 in various calendars
Gregorian calendar831
DCCCXXXI
Ab urbe condita1584
Armenian calendar280
ԹՎ ՄՁ
Assyrian calendar5581
Balinese saka calendar752–753
Bengali calendar238
Berber calendar1781
Buddhist calendar1375
Burmese calendar193
Byzantine calendar6339–6340
Chinese calendar庚戌年 (Metal Dog)
3528 or 3321
    — to —
辛亥年 (Metal Pig)
3529 or 3322
Coptic calendar547–548
Discordian calendar1997
Ethiopian calendar823–824
Hebrew calendar4591–4592
Hindu calendars
 - Vikram Samvat887–888
 - Shaka Samvat752–753
 - Kali Yuga3931–3932
Holocene calendar10831
Iranian calendar209–210
Islamic calendar215–216
Japanese calendarTenchō 8
(天長8年)
Javanese calendar727–728
Julian calendar831
DCCCXXXI
Korean calendar3164
Minguo calendar1081 before ROC
民前1081年
Nanakshahi calendar−637
Seleucid era1142/1143 AG
Thai solar calendar1373–1374
Tibetan calendar阳金狗年
(male Iron-Dog)
957 or 576 or −196
    — to —
阴金猪年
(female Iron-Pig)
958 or 577 or −195
Ansgar brings Christianity to the Swedes

Year 831 (DCCCXXXI) was a common year starting on Sunday (link will display the full calendar) of the Julian calendar.