IV. For the three Photian synods of 861 (deposition of Ignatius), 867 (attempted deposition of Nicholas I), and 879 (recognition of Photius as lawful patriarch), recognized by the Greeks as Eighth General Council in opposition to the council of 869-70, which they continue to abominate, see PHOTIUS. :
The Catholic Encyclopedia
Photian Synods of Constantinople (861, 867, 879)
1 section
Charles G. Herbermann and others (editors)
Transcribed from a dated scan; artifacts may remain. Edition notes
Trans. None. Written in English by the contributors whose signatures close each article., The Catholic Encyclopedia, An International Work of Reference on the Constitution, Doctrine, Discipline, and History of the Catholic Church, in fifteen volumes, 1907-1908. Public domain.