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Abu Ali Hasan ibn Ali Tusi (April 10, 1018 – October 14, 1092), better known by his honorific title of Nizam al-Mulk (Persian: 'Order of the Realm') was a Persian scholar and vizier of the Seljuq Empire. He held near absolute power for 20 years after the assassination of Alp Arslan in 1072.<br/><br/> Nizam al-Mulk was in turn assassinated en route from Isfahan to Baghdad on 14 October 1092. It is recorded that he was stabbed by the dagger of a member of the Assassins (Hashshashin) 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.