|Covid-19|Béjaïa becomes the capital of the Hammadid Dynasty in Algeria.
Third expedition of the Almoravid army in al-Andalus destined to definitely subdue the taifas kingdoms. Córdoba, Seville, Grenada, Málaga, Almería and Ronda fall to the troops of Yusuf ibn Tashfin.
Troubadours begin playing in Provence.
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)
April 16 – Sikelgaita, duchess of Apulia (b. c. 1040)
June 26 – Jaromír, Bishop of Prague
July 3 – Egbert II, Margrave of Meissen (b. c. 1060)
October 6 – Saint Adalbero
Year 1090 (MXC) was a common year starting on Tuesday (link will display the full calendar) of the Julian calendar.
(Text) CC BY-SA