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*863 First translations of [[Holy Scripture|Biblical]] and liturgical texts into [[Church Slavonic]] by [[Cyril and Methodius]].
*863 Venetians steal relics of [[Apostle Mark]] from Alexandria.
*864 Baptism of Prince [[Boris I of Bulgaria|Boris of Bulgaria]]; [[Synaxis]] of the [[Theotokos]] in Miasena in memory of the return of her icon. *865 Bulgaria under Khan [[Boris I of Bulgaria|Boris I]] converts to [[Orthodox Church|Orthodox Christianity]].
*866 Vikings raid and capture York in England.
*867 [[Council of Constantinople (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.