Columbia subject headings:
Empresses--Mediterranean Region--Biography--Congresses.
Queens--Mediterranean Region--Biography--Congresses.
Women heads of state--Mediterranean Region--Biography--Congresses.
Women--History--Middle Ages, 500-1500--Congresses.
Harvard subject headings:
Empresses--Mediterranean Region--Biography--Congresses.
Queens--Mediterranean Region--Biography--Congresses.
Women heads of state--Mediterranean Region--Biography--Congresses.
Women--History--Middle Ages, 500-1500--Congresses.
Princeton subject headings:
Empresses--Mediterranean Region--Biography--Congresses.
Queens--Mediterranean Region--Biography--Congresses.
Women heads of state--Mediterranean Region--Biography--Congresses.
Women--History--Congresses.