Columbia subject headings:
Orthodox Eastern Church--Controversial literature.
Theology--Early works to 1800.
Theology--History--Early church, ca. 30-600.
Theology.
Harvard subject headings:
Byzantine literature.
Christian life--Orthodox Eastern authors--Early works to 1800.
Christian literature, Byzantine
Orthodox Eastern Church--Doctrines--Early works to 1800.
Theognōstos, hieromonachos, active 13th century.
Theognōstos, hieromonachos, active 13th century. Thesaurus.
Theology--Early works to 1800
Princeton subject headings:
Orthodox Eastern Church--Doctrines--Early works to 1800.
Theology--Early works to 1800.
Theology--History--Middle Ages, 600-1500.