Title: On the mystagogy of the Holy Spirit
Subjects: Doctrines, Constantinople (Ecumenical patriarchate), Bishops, Orthodox Eastern Church, Procession, Mystagogy, Holy Spirit, History of doctrines, Biography, Heiliger Geist, Doctrinal Theology, History
Places: Constantinople (Ecumenical patriarchate), Istanbul, Istanbul (Turkey), Turkey
People: Photius I Saint, Patriarch of Constantinople (ca. 820-ca. 891)
Time periods: Middle Ages, 600-1500