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POPSJihad - idea and history Patricia Crone is professor of Islamic history at the Institute for Advanced Study, Princeton. Her publications include Meccan Trade and the Rise of Islam (Princeton University Press, 1987 , God's Caliph: Religious Authority in the First Centuries of Islam (Cambridge University Press, 2003), and Medieval Islamic Political Thought (Edinburgh University Press, 2004; published in the United States as God's Rule: Government and Islam ).