1090

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

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

Hassan-i Sabbah (c. 1050–1124)

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.

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