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==== Middle East ==== * [[Ibn al-Haytham]] ('''Alhazen'''), an Arab [[Science in the medieval Islamic world|scientist]] working in [[Egypt in the Middle Ages|Egypt]], feigns madness for fear of angering Caliph [[Al-Hakim bi-Amr Allah]], and is kept under [[house arrest]]. During this time he begins writing his influential ''[[Book of Optics]]''. * The [[Baghdad Manifesto]] is ordered by Caliph [[Al-Qadir]] of the [[Abbasid Caliphate]], in response to the growth of the [[Fatimid Caliphate|Fatimid]]-supporting [[Isma'ilism|Ismaili]] sect of [[Islam]] within his borders.
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