Columbia subject headings:
Harvard subject headings:
Gherardesca family.
Pisa (Italy)--History.
Sardinia (Italy)--History--456-1297.
Sardinia (Italy)--History--Aragonese and Spanish rule, 1297-1708.
Visconti family.
Princeton subject headings:
Pisa (Italy)--History.
Pisa (Italy)--Kings and rulers.
Pisa (Italy)--Politics and government.
Sardinia (Italy)--History--456-1297.
Sardinia (Italy)--History--Aragonese and Spanish rule, 1297-1708.
Sardinia (Italy)--Kings and rulers.
Sardinia (Italy)--Politics and government.