Columbia subject headings:
Harvard subject headings:
Byzantine Empire--Church history--Sources.
Church history--Middle Ages, 600-1500--Sources.
Iconoclasm
Iconoclasm--Controversial literature.
Theophilos, Emperor of Constantinople, -842.
Princeton subject headings:
Byzantine Empire--Church history--Sources.
Church and state--Byzantine Empire--History--Sources.
Iconoclasm--Controversial literature.
Orthodox Eastern Church--Apologetic works.
Theophilos, Emperor of Constantinople, -842--Correspondence.