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

1090 by topic
Leaders
Political entities State leaders Religious leaders
Birth and death categories
Births – Deaths
Establishments and disestablishments categories
Establishments – Disestablishments
v t e

1090 in various 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) 3787 or 3580 — to — 庚午年 (Metal Horse) 3788 or 3581
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

Year 1090 (MXC) was a common year starting on Tuesday (link will display the full calendar) of the Julian calendar.

Events

A third Almoravid expedition is launched in Al-Andalus, designed to finally subdue the Taifa's Kingdoms. The cities of Córdoba, Seville, Granada, Málaga, Almería and Ronda fall to the troops of Sultan Yusuf ibn Tashfin.^[1]
King Stephen II of Croatia becomes involved in an open conflict between factions of Croatian nobles, who reassert their traditional rights in their own counties.

Hassan-i Sabbah founds the Nizari Ismaili state after taking control of the Alamut Castle and organising the military group called the Order of Assassins.^[2]

Béjaïa (or Bugia) becomes the capital of the Hammadid Dynasty in modern Algeria. It becomes an important port and centre of culture.

Troubadours begin playing in western Aquitaine (Poitou and Saintonge) and Gascony (approximate date).

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

Births

January 17 – Qin Hui, Chinese chancellor (d. 1155)
unknown dates
- Frederick II (the One-Eyed), German nobleman (d. 1147)^[3]
Fujiwara no Atsuyori (or Dōin), Japanese waka poet (d. 1179)^[4]
probable
- Agnes I, German abbess of Quedlinburg (approximate date)
- Alaungsithu, Burmese king of the Pagan Dynasty (d. 1167)
- Arnold of Brescia, Italian canon regular (approximate date)
- Bernard of Clairvaux, French abbot and theologian (d. 1153)
- Chen Yuyi, Chinese politician of the Song Dynasty (d. 1138)
- Eliezer ben Nathan, German rabbi and liturgical poet (d. 1170)
- Eric II (the Memorable), king of Denmark (approximate date)
- Fujiwara no Akisuke, Japanese nobleman and poet (d. 1155)
- Juliane de Fontevrault, illegitimate daughter of King Henry I of England
- Conrad I, German nobleman and rector of Burgundy (d. 1152)
- Niklot (or Nyklot), Obotrite prince and tribal chief (d. 1160)
- Robert FitzRoy, 1st Earl of Gloucester
- Theobald II (the Great), French nobleman
- Theobald of Bec, archbishop of Canterbury
- William de Mohun, 1st Earl of Somerset