Columbia subject headings:
Harvard subject headings:
Byzantine Empire--History--1081-1453.
Byzantine Empire--Relations--Foreign countries.
Byzantine Empire--Relations.
Seljuks--History.
Turkey--History--To 1453.
Princeton subject headings:
Byzantine Empire--History--1081-1453.
Byzantine Empire--Relations--Islamic Empire.
Islamic Empire--History--750-1258.
Islamic Empire--Relations--Byzantine Empire.
Seljuks.