845 deaths

Arab scholar, biographer and historian (784/5-845)

Islamic mathematician and astronomer

group of christian Martyrs

King of the Picts

Patriarch of Antioch, head of the Syriac Orthodox Church

Turgesius (died 845) (also called Turgeis, Tuirgeis, Turges, and Thorgest) was a Viking chief active in Ireland during the 9th century. Turgesius Island, the principal island on Lough Lene, is named after him. It is not at all clear whether the names in the Irish annals represent the Old Norse Thurgestr or Thorgísl. John O'Donovan and Charles Haliday independently identified him with Ragnar Loðbrók, but the identification is not generally accepted.

9th century Syriac astronomer and mathematician (c. 786 - c. 845)