Columbia subject headings:
Christianity and other religions--Islam.
Islam--Relations--Christianity.
Martyrs--Spain--Córdoba.
Spain--Church history.
Harvard subject headings:
Christianity and other religions--Islam
Islam--Relations--Christianity
Martyrs--Spain--Córdoba.
Spain--Church history.
Princeton subject headings:
Christian martyrs--Spain--Córdoba--History.
Christianity and other religions--Islam.
Islam--Relations--Christianity.
Spain--Church history.