Columbia subject headings:
Castro, Scipione di, active 16th century.
Italy--History--16th century.
Papal States--History.
Spies--Italy--Biography.
Statesmen--Italy--Biography.
Harvard subject headings:
Castro, Scipione di, active 16th century.
Impostors and imposture--Italy--Biography.
Impostors and imposture--Switzerland--Biography.
Italy--History--16th century.
Papal States--History--1417-1605.
Spies--Italy--Biography.
Statesmen--Italy--Biography.
Princeton subject headings: