Editing 1011 (section)

=== By place ===

==== Europe ====

* [[June 11]] &ndash; [[Norman conquest of southern Italy#Lombard revolt, 1009–1022|Lombard Revolt]]: Mahmoud the Fat of [[Bari]] rises up against the [[Lombardy|Lombard]] rebels, led by [[Melus of Bari|Melus]], and delivers the city to [[Basil Mesardonites]], Byzantine governor (''[[Katepano|catepan]]'') of the [[Catepanate of Italy]]. Melus is forced to flee to [[Salerno]], and his brother-in-law [[Dattus]] escapes to [[Monte Cassino]], but their families are taken captive, and carted off to [[Constantinople]].{{sfn|Norwich|1967}} 
* Autumn &ndash; Basil Mesardonites visits [[Guaimar III of Salerno]] to secure his cooperation. Melus is forced to flee again. Basil proceeds to Monte Cassino – and persuades Abbot [[Atenulf (abbot of Montecassino)|Atenulf]] to expel Dattus. Pope [[Pope Sergius IV|Sergius IV]] supports Dattus with papal troops, to garrison the tower on the [[Garigliano|Garigliano River]], a fortified complex in the territory of the [[Duchy of Gaeta]].
* King [[Henry II, Holy Roman Emperor|Henry II]] enfeoffs [[Adalbero, Duke of Carinthia|Adalbero]] with [[Duchy of Carinthia|Carinthia]] (including the rule over the [[March of Verona]]) after the death of Duke [[Conrad I, Duke of Carinthia|Conrad I]].
* The Grand Prince of Kyiv and ruler of [[Kievan Rus']] [[Vladimir the Great]] laid the first foundations of [[Saint Sophia Cathedral, Kyiv]].

==== England ====

* [[September 29]] &ndash; [[Siege of Canterbury]]: Danish [[Vikings|Viking]] raiders led by [[Thorkell the Tall]] pillage [[Canterbury]] after a siege, taking [[Ælfheah of Canterbury|Ælfheah]], archbishop of Canterbury, as a prisoner.{{sfn|Palmer|Palmer|1992}}
* [[Byrhtferth]], Benedictine [[monk]] of [[Ramsey Abbey]], writes his ''Manual'' (''Enchiridion'') on the divine order of the universe and [[time]].{{sfn|Palmer|Palmer|1992}}

==== 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.

==== Asia ====

* Emperor [[Emperor Ichijō|Ichijō]] abdicates the throne and dies later after a 25-year reign. He is succeeded by his cousin [[Emperor Sanjō|Sanjō]] as the 67th emperor of [[Japan]].
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