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840 CE
850 CE
860 CE
842 CE - 867 CE: Reign of Byzantine emperor Michael III.
842 CE - 855 CE: Theodora rules as regent for her son Michael III, emperor of the Byzantine empire.
855 CE - 856 CE: Michael III removes his mother Theodora, the regent, and rules alone as emperor of the Byzantine empire.
856 CE: The armies of Byzantine emperor Michael III win great victories in Cappadocia and Mesopotamia.
863 CE: Byzantine emperor Michael III sends Saint Cyril and Methodius on a mission to Moravia.
864 CE: Byzantine emperor Michael III presides over the baptism of Boris I, khan of the Bulgars.
865 CE: Byzantine emperor Michael III arranges for the chief minister Bardas to be assassinated by Basil the Macedonian.
866 CE: Byzantine emperor Michael III makes Basil the Macedonian co-emperor.
867 CE: Basil the Macedonian murders Byzantine emperor Michael III and declares himself Emperor Basil I.