842 deaths

Byzantine emperor from 829 to 842

Abū Isḥāq Muḥammad ibn Hārūn al-Rashīd (; October 796 – 5 January 842), better known by his regnal name al-Muʿtaṣim biʾllāh (, ), was the eighth Abbasid caliph, ruling from 833 until his death in 842. When al-Ma'mun died unexpectedly on campaign in August 833, al-Mu'tasim was thus well placed to succeed him, with the support of the powerful chief , Ahmad ibn Abi Duwad, he continued to implement the rationalist Islamic doctrine of Mu'tazilism and implementing policy.

King of Galicia (c. 760 – 842)

Emperor of Japan

Chinese writer and philosopher (772-842)

Uurad or Ferat son of Bargoit (died 842) was king of the Picts, from 839 to 842.

Theophobos () or Theophobus, originally Nasir (), Nasr (), or Nusayr (), was a commander of the Khurramites who converted to Christianity and entered Byzantine service under Emperor Theophilos (). Raised to high rank and married into the imperial family, Theophobos was given command of his fellow Khurramites and served under Theophilos in his wars against the Abbasid Caliphate in 837–838. After the Byzantines' defeat at the Battle of Anzen, he was proclaimed emperor by his own men, but did not pursue this claim. Instead he peacefully submitted to Theophilos in the next year and was apparently

Bishop of Vienne

Patriarch lf Jerusalem

German bishop