OPINION: ISIS Appeals to a Longing for the Caliphate

When, all of a sudden, ISIS (Islamic State in Iraq and Syria) emerged on the scene and in a matter of days occupied large swathes of mainly Sunni-inhabited parts of Iraq and Syria, including Iraq’s second city Mosul and Tikrit, birthplace of Saddam Hussein, and called itself the Islamic State, many people, not least Western politicians and intelligence services, were taken by surprise.