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820 CE
820 CE - 829 CE: Reign of Byzantine emperor Michael II.
820 CE - 823 CE: Byzantine emperor Michael II puts down a revolt led by Thomas the Slav.
820 CE: Byzantine emperor Leo V the Armenian is murdered by supporters of his successor Michael II.
821 CE - 822 CE: Greek Fire is used by Byzantine ships to attack a Slav fleet besieging Constantinople.
821 CE - 823 CE: Thomas the Slav unsuccessfully besieges Constantinople.