Editing 1156 (section)

==== Europe ====
[[Image:Henrik Lalli Ekman.JPG|thumb|''The murder of [[Henry, Bishop of Uppsala|St. Henry]] by [[Lalli]]'', painting by Karl Anders Ekman (1854)]]
* [[January 20]] &ndash; Freeholder [[Lalli]] slays the English missionary-bishop [[Bishop Henry|Henry]] with an axe, on the ice of Lake [[Köyliönjärvi]] in [[Finland]] (according to [[legend]]).
* [[February]] &ndash; [[Domenico Morosini]], doge of [[Republic of Venice|Venice]] ([[Morosini family|House of Morosini]]), dies after an 8-year reign. He is succeeded by [[Vitale II Michiel]] as ruler of Venice.
* [[May 28]] &ndash; King [[William I of Sicily|William I]] ('''the Bad''') lands with a Sicilian expeditionary force in [[Apulia]]. He defeats the Byzantine army at [[Brindisi]] and recaptures [[Bari]]. 
* [[June 9]] &ndash; Emperor [[Frederick I, Holy Roman Emperor|Frederick I]] ('''Barbarossa''') marries [[Beatrice I, Countess of Burgundy|Beatrice I]], daughter of [[Reginald III, Count of Burgundy|Reginald III]], adding the [[County of Burgundy]] to the [[Holy Roman Empire]].
* [[June 18]] &ndash; Pope [[Pope Adrian IV|Adrian IV]] comes to terms, and signs the [[Treaty of Benevento]]. He recognises the suzerainty of William I as ruler of [[Kingdom of Sicily|Sicily]] and [[Kingdom of Italy (Holy Roman Empire)|Italy]].<ref>{{cite book|last=Kleinhenz|first=Christopher|title=Medieval Italy: an encyclopedia|year=2010|publisher=Routledge|location=New York|isbn=978-0-415-93930-0|url=https://books.google.com/books?id=1piMMqjAf1MC&q=gran+tavola+bonsignori|page=95}}</ref>
* [[September 17]] &ndash; Frederick I makes the [[Margraviate of Austria]] a duchy and gives the [[Babenberg|Babenberg Dynasty]] special privileges (the ''[[Privilegium Minus]]'').
* [[Yuri Dolgorukiy]], Grand Prince of [[Principality of Kiev|Kiev]], founds and fortifies the town of [[Moscow]] and erects a wooden [[Moscow Kremlin|Kremlin]] within the settlement (approximate date).
* [[December 25]] &ndash; King [[Sverker I of Sweden|Sverker I]] ('''the Elder''') is murdered on his way to church. He is succeeded by his rival, [[Eric IX of Sweden|Eric IX]] ('''the Holy'''), as ruler of [[Sweden]].