Columbia subject headings:
Karacahisar (Eskişehir İli, Turkey)--History.
Osman I, Sultan of the Turks, 1258-1326.
Turkey--History--1288-1453.
Harvard subject headings:
Eskişehir İli (Turkey)--History--13th century.
Karacahisar (Eskişehir İli, Turkey)--History--13th century.
Osman I, Sultan of the Turks, 1258-1326.
Turkey--Administrative and political divisions--History--13th century.
Turkey--History--1288-1453.
Princeton subject headings: