1090

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.Gilbert Meynier (2010) L'Algérie cœur du Maghreb classique. De l'ouverture islamo-arabe au repli (658-1518). Paris: La Découverte; pp.83.

 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

 References