1090

Millennium:	2nd millennium
Centuries:	10th century–11th century–12th century
Decades:	1060s1070s1080s–1090s–1100s1110s1120s
Years:	108710881089–1090–109110921093

1090 in othercalendars

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	3Will. 2– 4Will. 2
Buddhist calendar	1634
Burmese calendar	452
Byzantine calendar	6598–6599
Chinese calendar	Kỷ tịNiên(EarthSnake) 3786 or 3726 — to — Canh ngọ niên(MetalHorse) 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	Kanji4 ( khoan trị ４ niên )
Javanese calendar	994–995
Julian calendar	1090 MXC
Korean calendar	3423
Minguo calendar	822 beforeROC Dân tiền 822 niên
Nanakshahi calendar	−378
Seleucid era	1401/1402AG
Thai solar calendar	1632–1633
Tibetan calendar	Âm thổ xà niên (female Earth-Snake) 1216 or 835 or 63 — to — Dương kim mã niên (male Iron-Horse) 1217 or 836 or 64

1090(MXC) was acommon year starting on Tuesdayof theJulian calendar,the 1090th year of theCommon Era(CE) andAnno Domini(AD) designations, the 90th year of the2nd millennium,the 90th year of the11th century,and the 1st year of the1090sdecade. 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.

Hassan-i Sabbah (c. 1050–1124)

Events

By area

Africa

• Béjaïabecomes the capital of theHammadidDynasty inAlgeria.

Europe

• Third expedition of theAlmoravidarmy inal-Andaluswho subdue thetaifas kingdoms.Córdoba,Seville,Grenada,Málaga,AlmeríaandRondafall to the troops ofYusuf ibn Tashfin.

By topic

Arts and culture

• Troubadoursbegin playing inProvence.

Technology

• Song DynastyChinese writerQin Guanwrites theCan Shu(Book ofSericulture), which describes asilk-reeling machine that has the world's oldest knownmechanical belt drive.

Births

• SaintBernard of Clairvaux(d.1153)
• Eliezer ben NathanofMainz
• Qin Hui,ChineseSong DynastyPrime Minister (d.1155)

Deaths

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