sentences:  This raised an acute problem for the Nizari faithful, as the line of divinely ordained imams could not possibly be broken.At first, some Nizaris held that Nizar was not dead would return as the Mahdi (or at least with him).Indeed, coinage from Alamut Castle, the centre of Hassan's nascent Nizari Isma'ili state in central Persia, was minted with Nizar's regnal name of "al-Mustafa li-Din Allah" until 1162.