Columbia subject headings:
Christian education--Byzantine Empire--History.
Education, Higher--Byzantine Empire--History.
Education, Medieval--Byzantine Empire--History.
Harvard subject headings:
Education, Higher--Turkey--Istanbul--History.
Education, Medieval--Byzantine Empire.
Universities and colleges--Byzantine Empire.
Princeton subject headings:
Education, Higher--Turkey--Istanbul--History--13th century.
Education, Higher--Turkey--Istanbul--History--14th century.