Columbia subject headings:
Martyrdom in literature--Congresses.
Martyrdom--Christianity--History--Congresses.
Martyrdom--History--Congresses.
Martyrdom--Islam--History--Congresses.
Martyrologies--History and criticism--Congresses.
Harvard subject headings:
Martyrs--History--Congresses.
Martyrs--History.
Persecution--History
Persecution--History--Congresses.
Princeton subject headings: