The Qarmatian Sevener branch accepted a Persian prisoner by the name of Abu'l - Fadl al - Isfahani from Isfahan as the returned Muhammad ibn Ismail and also as their Mahdi .
Isfahan claimed to be the descendant of the Persian kings .
The Qarmatian Sevener branch accepted a Persian prisoner by the name of Abu'l - Fadl al - Isfahani from Isfahan , who claimed to be the descendant of the Persian kings , as the returned Muhammad ibn Ismail and also as their Mahdi .