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*ca. 860 [[w:Christianization of the Rus' Khaganate|Christianization of the Rus' Khaganate]].
*861 [[Cyril and Methodius]] of Thessaloniki depart from Constantinople to [[Church of Russia#Conversion of the Slavs|missionize the Slavs]]; Council of Constantinople attended by 318 fathers and presided over by papal legates confirms [[Photius the Great]] as patriarch and passes 17 canons.
*864 Baptism of Prince [[Boris I of Bulgaria]]; [[Synaxis]] of the [[Theotokos]] in Miasena in memory of the return of her icon.
[[Image:ByzantineEmpire 867AD.JPG|right|thumb|220px|Byzantine Empire, ca. 867 AD.]]
*867 Council in Constantinople held, presided over by [[Photius the Great|Photius]], which anathematizes Pope [[Nicholas I of Rome]] for his attacks on work of Greek missionaries in Bulgaria and use by papal missionaries of [[Filioque]]; Pope Nicholas dies before hearing news of excommunication; [[Basil the Macedonian]] has Emperor [[Michael III]] murdered and usurps Imperial throne, reinstating Ignatius as patriarch of Constantinople.
