Columbia subject headings:
Europe--Foreign relations--Turkey.
Europe--History, Military.
Turkey--Foreign relations--Europe.
Turkey--History, Military.
Harvard subject headings:
Europe--Foreign relations--Turkey.
Europe--History, Military.
Turkey--Foreign relations--Europe.
Turkey--History, Military.
Princeton subject headings:
Arab countries--Foreign relations--Germany.
Germany--Foreign relations--Arab countries.
Germany--History--843-1273.
Holy Roman Empire--History--843-1273.