Columbia subject headings:
Byzantine Empire--Foreign relations--Turkey.
Romania--Foreign relations--Turkey.
Turkey--Foreign relations--Byzantine Empire.
Turkey--Foreign relations--Romania.
Turkey--History--1288-1453.
Harvard subject headings:
Byzantine Empire--Foreign relations--Turkey.
Romania--Foreign relations--Turkey.
Turkey--Foreign relations--Byzantine Empire.
Turkey--Foreign relations--Romania.
Turkey--History--1288-1453.
Princeton subject headings:
Romania--Foreign relations--Turkey.
Turkey--Foreign relations--Romania.
Turkey--History--Ottoman Empire, 1288-1918.