Bury, A History of the Eastern Roman Empire from the Fall of Irene to the Accession of Basil I (A.D. 802–867), London, 1912. Smith, Jason Domonick "John Grammatikos: An Oblique History of a Damned Patriarch", Thesis, California State University, Sacramento, 2010. http://csus-dspace.calstate.edu/handle/10211.9/503 860s deaths 9th-century patriarchs of Constantinople Byzantine people of Armenian descent Year of birth unknown Ambassadors of the Byzantine Empire to the Abbasid Caliphate Byzantine Iconoclasm