Events By Place Asia Abbasid caliph al-Mutasim establishes a new capital at Samarra, Iraq. Europe Egbert of Wessex is defeated by the Danes. Presian succeeds Malamir as Khan of Bulgaria. Oldest known mention of the city of Soest, Germany. Petrus Tradonicus Pola appointed Roman consul and duke of Venice. By Topic Religion John VII Grammaticus succeeds Antony I as Patriarch of Constantinople. Births Thabit ibn Kurrah, Arabian astronomer Fujiwara no Mototsune, Japanese regent (d. 891)… (More on 836)