Title: A successful Council of Union
Subjects: Catholic Church, Christian union, Council of Union, 879-880, Doctrinal Theology, History, Orthodox Eastern Church, Relations, Interfaith relations, Middle Ages, Council of Union (879-880)
People: Joannes VIII Pope (d. 882), Photius I Saint, Patriarch of Constantinople (ca. 820-ca. 891)
Time periods: Middle Ages, 600-1500