*838 Caliph al-Mu'tasim captures and destroys Ammoria in Anatolia.
*ca. 839 First [[w:Paphlagonian expedition of the Rus|Rus'-Byzantine War]], where the Rus attacked Propontis (probably aiming for Constantinople) before turning east and raiding Paphlagonia.
*843 [[Triumph of Orthodoxy]] occurs on first Sunday of [[Great Lent]], restoring [[iconography|icons]] to churches.
==Late Byzantine era (843-1453)==