Columbia subject headings:
Harvard subject headings:
Biographies
Christian women--Italy--Rome--Biography.
Marozia, approximately 892-approximately 937
Nobility--Italy--Rome--Biography.
Rome (Italy)--Church history
Sergius III, Pope, -911
Princeton subject headings:
Empresses--Byzantine Empire--To 1500--Biography.
Europe--Kings and rulers--To 1500--Biography.
Papacy--History--To 1309.
Queens--Europe--To 1500--Biography.
Regents--Europe--To 1500--Biography.