    __notoc__ year 1090 (mxc) was a common year starting on tuesday (link will display the full calendar) of the julian calendar. == events == ===by area=== ====africa==== * bÃ©jaÃ¯a becomes the capital of the hammadid dynasty in algeria. ====europe==== * third expedition of the almoravid army in al-andalus destined to definitely subdue the taifas kingdoms. cÃ³rdoba, seville, grenada, mÃ¡laga, almerÃ­a and ronda fall to the troops of yusuf ibn tashfin.gilbert meynier (2010) l'algÃ©rie cÅur du maghreb classique. de l'ouverture islamo-arabe au repli (658-1518). paris: la dÃ©couverte; pp.83. ===by topic=== ====arts and culture==== * troubadours begin playing in provence. ====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. == births == * saint bernard of clairvaux (d. 1153) * eliezer ben nathan of mainz * qin hui, chinese song dynasty prime minister (d. 1155) == deaths == * june 26 &ndash; jaromÃ­r (bishop of prague) * july 3 &ndash; egbert ii, margrave of meissen (b. c. 1060) * october 6 &ndash; saint adalbero == references ==  
1090