Columbia subject headings:
Assassination--Islamic Empire.
Political crimes and offenses--Islamic Empire.
Political violence--Islamic Empire.
Harvard subject headings:
Assassination--Islamic Empire--History.
Caliphate--History
Islamic Empire--History.
Political crimes and offenses--Islamic Empire--History.
Political violence--Islamic Empire--History.
Princeton subject headings:
Assassination--Islamic Empire--History.
Caliphate--History.
Islamic Empire--History.
Political crimes and offenses--Islamic Empire--History.
Political violence--Islamic Empire--History.