his nephew Al-Abbas ibn al-Ma'mun on the throne. A widespread purge of the army follows, which cements the leading role of the Turkish slave-soldiers (ghilman) in the Abbasid military establishment. Babak Khorramdin, an Iranian military leader, is executed by order of al-Mu'tasim. The Yezidi rise up against the Abbasids (approximate date). By topic Religion The oldest known mention is made of the city of Rheine, on the Ems River (modern Germany). The Khazars are converted to Judaism (approximate date). Births Æthelswith, Anglo-Saxon queen (approximate date) Fujiwara no Takafuji, Japanese nobleman (d. 900) Ubaydallah ibn Abdallah, Muslim governor (approximate date) Deaths November 6 – Li Yong, prince of the Tang Dynasty Al-Abbas ibn al-Ma'mun, Muslim prince and general Babak Khorramdin, Iranian leader of the Khurramite uprising against the Abbasid Caliphate Boniface II, margrave of Tuscany (approximate date) Bran mac Fáeláin, king of Leinster (Ireland) Eadhun, bishop of Winchester Frederick of Utrecht, Frisian bishop (approximate date) Pepin I of Aquitaine, king of Aquitaine (b. 797) Ralpacan, king of Tibet (approximate date) Ratimir, duke of Lower Pannonia 'Ujayf ibn 'Anbasa, Muslim general Willerich, bishop of Bremen Ziyadat Allah I, Muslim emir References