Columbia subject headings:
Conspiracies--Europe--History.
Conspiracy--Europe--History.
Europe--Politics and government--476-1492.
Political crimes and offenses--Europe--History.
Treason--Europe--History.
Harvard subject headings:
Conspiracies--Europe--History.
Europe--Politics and government--476-1492.
Treason--Europe--History.
Princeton subject headings:
Conspiracies--Europe--History.
Europe--Politics and government--476-1492.
Treason--Europe--History.