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820 CE
830 CE
840 CE
829 CE - 842 CE: Reign of Byzantine emperor Theophilos.
830 CE - 831 CE: Byzantine emperor Theophilos wins victories in Cilica and awards himself a triumph.
833 CE: Byzantine emperor Theophilos builds the Sarkel fortress on the Don river.
838 CE: The Arab Caliphate defeats a Byzantine army and captures the cities of Ankara and Amorion.
839 CE: The Byzantine empire loses Taranto in southern Italy to the western Arabs.