Columbia subject headings:
Balkan Peninsula--History.
Capitals (Cities)--Balkan Peninsula--History.
Capitals (Cities)--Europe, Eastern--History.
Europe, Eastern--History.
Harvard subject headings:
Balkan Peninsula--History.
Capitals (Cities)--Balkan Peninsula--History.
Capitals (Cities)--Europe, Eastern--History.
Cities and towns--Europe, Eastern--History.
Europe, Eastern--History.
Princeton subject headings:
Cities and towns--Europe, Eastern--History.
Europe, Eastern--History.