Jul 20 Ansegis [Ansegius], French abbot of Fontenelle and writer, dies at about 63 Aug 7 Al-Ma'mun, 7th Caliph of the Abbasid Caliphate (813-833), dies after drinking contaminated water at 47 (b. 786) 828 AD Famous Deaths by Year 835 AD Famous People by Cause of Death Assassination Car Crash Hanging Killed in Action Plane Crash Poisoning