Columbia subject headings:
Harvard subject headings:
Byzantine Empire--Civilization--527-1081
Byzantine Empire--History--11th century.
Byzantine Empire--Social conditions.
Cities and towns--Byzantine Empire--Growth.
Cities and towns--Byzantine Empire--History.
Eleventh century
Social structure--Byzantine Empire.
Sociology, Rural--Byzantine Empire.
Sociology, Urban--Byzantine Empire.
Princeton subject headings:
Byzantine Empire--History--1025-1081.
Byzantine Empire--Social conditions.
Cities and towns--Byzantine Empire.
Social structure--Byzantine Empire.