World Timeline

AD 842: January 20 – Emperor Theophilos dies of dysentery at Constantinople, after a 12-year reign in which he expended much effort defending the eastern frontier against the invading Muslim Arabs. Theophilos is succeeded by his 2-year-old son Michael III, with his mother Theodora as regent and the 'temporary' sole ruler of the Byzantine Empire.

AD 843: The Treaty of Verdun was signed, ending the Carolingian civil war and dividing the Carolingian Empire between Lothair I, Louis II and Charles II, the surviving sons of the emperor Louis I.