Columbia subject headings:
Byzantine Empire--History--Alexius I Comnenus, 1081-1118.
Byzantine Empire--History.
Harvard subject headings:
Byzantine Empire--History--Alexius I Comnenus, 1081-1118.
Byzantine Empire--History.
Princeton subject headings:
Byzantine Empire--History--Alexius I Comnenus, 1081-1118.
Byzantine Empire--History.