855 deaths

pope of the Catholic Church

Muslim jurist and theologian (780–855)

Emperor of the Carolingian Empire from 817 to 855

Arab historian of Abbasid era (777-854)

illegitimate son of Frankish emperor Charlemagne by the concubine Regina, bishop of Metz

Islamic Theologian

The son of Asad bin Saman and Amir of Shash (819–855)

thumb|250px|Michael III with Theodora and Theoktistos (with the white cap), from the Madrid Skylitzes

Odwulf of Evesham (or Odulf, Odulph, Odulfo, Odulphus; died 855) was a ninth century saint, monk and Frisian missionary.

Italian prince

Saint Folcwin or Folcuin (; Old Dutch: *Folkwin; French: Folquin) (d. 14 or 15 December 855) was a Frankish abbot, cleric, and Bishop of Thérouanne (appointed 816).

thumb|An illustration of Gozbald made by Johann Salver around 1713