Columbia subject headings:
Clement, of Alexandria, Saint, approximately 150-approximately 215.
Justin, Martyr, Saint.
Origen.
Harvard subject headings:
Clement, of Alexandria, Saint, approximately 150-approximately 215
Clement, of Alexandria, Saint, approximately 150-approximately 215.
Justin, Martyr, Saint
Justinian I, Emperor of the East, 483?-565
Origen
Princeton subject headings: