842 CE
Caliph Al-Mu'tasim dies at Samarra (modern Iraq), after an eight year reign. He is succeeded by his son Al-Wathiq, as ruler of the Abbasid Caliphate. Oaths of Strasbourg: King Louis the German, ruler of East Francia, and his half-brother Charles the Bald, ruler of West Francia, meet with their armies at Strasbourg. They agree to swear allegiance (recorded in vernacular languages) to each other, and to support each other against their brother Lothair I (nominal emperor of all the Frankish kingdoms and the Holy Roman Empire). The Medieval Iconoclastic Controversy ends, as a council in Constantinople formally reinstates the veneration of icons in the churches.
Geopolitics & Diplomacy
- February 14 – Oaths of Strasbourg: King Louis the German, ruler of East Francia, and his half-brother Charles the Bald, ruler of West Francia, meet with their armies at Strasbourg. They agree to swear allegiance (recorded in vernacular languages) to each other, and to support each other against their brother Lothair I (nominal emperor of all the Frankish kingdoms and the Holy Roman Empire).source
Religion & Belief
- February 19 – The Medieval Iconoclastic Controversy ends, as a council in Constantinople formally reinstates the veneration of icons in the churches.source
- Abbasid caliph Al-Wathiq appointed his brother, Jaʽfar ibn Muhammad al-Mutasim (future al-Mutawakkil) as Leader of Hajj in 842.source
- Vikings attack the Irish monastery at Clonmacnoise from bases in Ireland.source
Science & Discovery
- February 13 – Last reported sighting of the comet X/841 Y1 according to the Annals of Fontenelle.source
Births
Deaths
- January 5 – Caliph Al-Mu'tasim dies at Samarra (modern Iraq), after an eight year reign. He is succeeded by his son Al-Wathiq, as ruler of the Abbasid Caliphate.source
- January 5 – Al-Mu'tasim, Muslim caliph (b. 796)source
- January 20 – Theophilus, Byzantine emperor (b. 813)source
- 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.source
- March 9 – Humbert, bishop of Würzburgsource
- March 16 – Xiao Mian, chancellor of the Tang Dynastysource
- March 20 – King Alfonso II of Asturias (Northern Spain) dies after a 50-year reign, in which he undertook numerous campaigns against the Muslim armies of the Umayyad Emirate of Córdoba, and allied himself with the late Charlemagne. The childless Alfonso chooses Ramiro I, son of former king Bermudo I, as his successor.source
- August 16 – Death of Qaratis also known as Umm Harun, was the mother of Abbasid caliph al-Wathiq (r. 842–847). She died during her Hajj pilgrimage journey.source
- August 24 – Saga, emperor of Japan (b. 786)source
- October 22 – Abo, Japanese prince (b. 792)source
- Sugawara no Kiyotomo, Japanese nobleman (b. 770)source
- Liu Yuxi, Chinese poet and philosopher (b. 772)source
- Dúngal mac Fergaile, king of Osraige (Ireland)source
- Uurad of the Picts dies after a 3-year reign, and is succeeded by his son Bridei VI, who contests his power with rival groups, led by Bruide son of Fokel and Kenneth MacAlpin.source