The Arabic letter for N for Nassarah, meaning Christian, was spray-painted on their houses, with stencils declaring them to be “Property of the Islamic State”. Monks from the monastery of Mar Behnam, near Qaraqosh, south-east of Mosul, were allowed to take only the clothes they were wearing. “You have no place here any more,” the jihadists are reported to have said (The Economist, July 24th).So, for the first time in at least 1,600 years, no Christians will be living in the city (the Mar Behnam monastery dates from the 4th century). They aren't the only religious groups being treated harshly by ISIS. So are Shia Muslims and Yazidis, the latter of which have ties to Zoroastrianism.