1123 (MCXXIII) was a common year starting on Monday of the Julian calendar, the 1123rd year of the Common Era (CE) and Anno Domini (AD) designations, the 123rd year of the 2nd millennium, the 23rd year of the 12th century, and the 4th year of the 1120s decade. As of the start of 1123, the Gregorian calendar was 7 days ahead of the Julian calendar, which was the dominant calendar of the time.

Millennium: 2nd millennium
Centuries: 11th century12th century13th century
Decades: 1090s  1100s  1110s  – 1120s –  1130s  1140s  1150s
Years: 1120 1121 112211231124 1125 1126
1123 in other calendars
Gregorian calendar1123
MCXXIII
Ab urbe condita1876
Armenian calendar572
ԹՎ ՇՀԲ
Assyrian calendar5873
Balinese saka calendar1044–1045
Bengali calendar530
Berber calendar2073
English Regnal year23 Hen. 1 – 24 Hen. 1
Buddhist calendar1667
Burmese calendar485
Byzantine calendar6631–6632
Chinese calendar壬寅(Water Tiger)
3819 or 3759
    — to —
癸卯年 (Water Rabbit)
3820 or 3760
Coptic calendar839–840
Discordian calendar2289
Ethiopian calendar1115–1116
Hebrew calendar4883–4884
Hindu calendars
 - Vikram Samvat1179–1180
 - Shaka Samvat1044–1045
 - Kali Yuga4223–4224
Holocene calendar11123
Igbo calendar123–124
Iranian calendar501–502
Islamic calendar516–517
Japanese calendarHōan 4
(保安4年)
Javanese calendar1028–1029
Julian calendar1123
MCXXIII
Korean calendar3456
Minguo calendar789 before ROC
民前789年
Nanakshahi calendar−345
Seleucid era1434/1435 AG
Thai solar calendar1665–1666
Tibetan calendar阳水虎年
(male Water-Tiger)
1249 or 868 or 96
    — to —
阴水兔年
(female Water-Rabbit)
1250 or 869 or 97

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