Columbia subject headings:
Philosophy--Byzantine Empire.
Political science--Byzantine Empire.
Rhetoric, Medieval--Byzantine Empire.
Harvard subject headings:
Byzantine Empire--Politics and government--1081-1453.
Gemistus Plethon, George, active 15th century.
Greek language, Medieval and late--Rhetoric--Early works to 1800.
Philosophy--Early works to 1800
Political science--Philosophy--Early works to 1800.
Rhetoric, Medieval.
Princeton subject headings:
Philosophy--Byzantine Empire.
Political science--Byzantine Empire.
Rhetoric, Medieval--Byzantine Empire.