Hassan-i Sabbah
Nizam al-Mulk was assassinated en route from Isfahan to Baghdad on 10 Ramadan 485 A.H. (14 October 1092) The mainstream literature says he was stabbed by the dagger of a member of the Assassins, sent by the notorious Hassan-i Sabbah near Nahavand, as he was being carried on his litter. The killer approached him disguised as a dervish.