Columbia subject headings:
Harvard subject headings:
Christianity and politics--History--Middle Ages, 600-1500.
Church history--Middle Ages, 600-1500
International relations
Islam and politics.
Religion and international relations.
Religion and politics
Terrorism--Religious aspects
Princeton subject headings:
Christianity and politics--History--Middle Ages, 600-1500.
Church history--Middle Ages, 600-1500.
International relations.
Islam and politics.
Religion and international relations.
Religion and politics.
Terrorism--Religious aspects.