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|1090 by topic|
|Lists of leaders|
|Political entities - State leaders - Religious leaders|
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|Births – Deaths|
|Establishments and disestablishments categories|
|Establishments – Disestablishments|
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- A third expedition of the Almoravid Army is launched in al-Andalus, designed to finally subdue the Taifa's Kingdoms. Córdoba, Seville, Grenada, Málaga, Almería and Ronda fall to the troops of Yusuf ibn Tashfin.
Arts and culture
Science and technology
- Song Dynasty Chinese author 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.
- Saint Bernard of Clairvaux (d. 1153)
- Eliezer ben Nathan of Mainz
- Qin Hui, Chinese Song Dynasty Prime Minister (d. 1155)
- Juliane de Fontevrault, French noble
- April 16 – Sikelgaita, Duchess of Apulia (b. c. 1040)
- May 12 – Liutold of Eppenstein, Duke of Carinthia (b. c. 1050)
- June 26 – Jaromír, Bishop of Prague
- July 3 – Egbert II, Margrave of Meissen (b. c. 1060)
- October 6 – Saint Adalbero
- Gilbert Meynier (2010) L'Algérie cœur du Maghreb classique. De l'ouverture islamo-arabe au repli (658-1518). Paris: La Découverte; pp.83.