The famous Wazir of Sultan Alp Arslan, second king of the Seljuqs. Nizamul Mulk served as a minister to Arslan and his son for thirty long years. He was a classmate of Umar Khayyam. Nizalmul Mulk authored the famous book Siyasat-nama. But he will be always remembered for founding the Madarsa-e-Nizamiya, which produced many scholars including Imam Ghazali and Saadi. Nizamul Mulk (Tusi)was stabbed to death by a follower of Hasan Sabbah the old man of the mountain.