Get our introductory offer at only
*$0.99/month for first 3 months
$29.90/month for the next 9 months
WHEN the Islamic State in Iraq and Syria (ISIS) declared its leader Abu Bakr al-Baghdadi caliph, it sought to take advantage of an idea that has a prominent place in Islamist thought, as well as significant popular legitimacy in the Muslim world. The institution of the caliphate dates back to...