1090

1090 (MXC) was a common year starting on Tuesday of the Julian calendar, the 1090th year of the Common Era (CE) and Anno Domini (AD) designations, the 90th year of the 2nd millennium, the 90th year of the 11th century, and the 1st year of the 1090s decade. As of the start of 1090, the Gregorian calendar was 6 days ahead of the Julian calendar, which was the dominant calendar of the time.

Millennium:	2nd millennium
Centuries:	10th century – 11th century – 12th century
Decades:	1060s  1070s  1080s  – 1090s –  1100s  1110s  1120s
Years:	1087 1088 1089 – 1090 – 1091 1092 1093

1090 in other calendars

Gregorian calendar	1090 MXC
Ab urbe condita	1843
Armenian calendar	539 ԹՎ ՇԼԹ
Assyrian calendar	5840
Balinese saka calendar	1011–1012
Bengali calendar	497
Berber calendar	2040
English Regnal year	3 Will. 2 – 4 Will. 2
Buddhist calendar	1634
Burmese calendar	452
Byzantine calendar	6598–6599
Chinese calendar	己巳年 (Earth Snake) 3786 or 3726     — to — 庚午年 (Metal Horse) 3787 or 3727
Coptic calendar	806–807
Discordian calendar	2256
Ethiopian calendar	1082–1083
Hebrew calendar	4850–4851
Hindu calendars
- Vikram Samvat	1146–1147
- Shaka Samvat	1011–1012
- Kali Yuga	4190–4191
Holocene calendar	11090
Igbo calendar	90–91
Iranian calendar	468–469
Islamic calendar	482–483
Japanese calendar	Kanji 4 (寛治４年)
Javanese calendar	994–995
Julian calendar	1090 MXC
Korean calendar	3423
Minguo calendar	822 before ROC 民前822年
Nanakshahi calendar	−378
Seleucid era	1401/1402 AG
Thai solar calendar	1632–1633
Tibetan calendar	阴土蛇年 (female Earth-Snake) 1216 or 835 or 63     — to — 阳金马年 (male Iron-Horse) 1217 or 836 or 64

Hassan-i Sabbah (c. 1050–1124)

Events

By area

Africa

• Béjaïa becomes the capital of the Hammadid Dynasty in Algeria.

Europe

• Third expedition of the Almoravid army in al-Andalus who subdue the taifas kingdoms. Córdoba, Seville, Grenada, Málaga, Almería and Ronda fall to the troops of Yusuf ibn Tashfin.

By topic

Arts and culture

• Troubadours begin playing in Provence.

Technology

• Song Dynasty Chinese writer Qin Guan writes the Can Shu (Book of Sericulture), which describes a silk-reeling machine that has the world's oldest known mechanical belt drive.

Births

• Saint Bernard of Clairvaux (d. 1153)
• Eliezer ben Nathan of Mainz
• Qin Hui, Chinese Song Dynasty Prime Minister (d. 1155)

Deaths

• June 26 – Jaromír (Bishop of Prague)
• July 3 – Egbert II, Margrave of Meissen (b. c. 1060)
• October 6 – Saint Adalbero