Columbia subject headings:
Harvard subject headings:
Emperors' spouses--History--Congresses.
Empresses
Empresses--History--Congresses.
Married women--History--Congresses.
Queens
Sex role--History--Congresses.
Social networks--History--Congresses.
Women in public life--History--To 1500--Congresses.
Women--Political activity--History--To 1500--Congresses.
Princeton subject headings:
Empresses.
Queens.
Women in public life--History--To 1500--Congresses.
Women--Political activity--History--To 1500--Congresses.