Longtime minister of the Seljuk sultans Alp Arslan and Malik Shah. Also known for his remarkable treatise on kingship, Siyasat Nameh (The book of government), which focused on the art of government, the requirements of majesty, and the threats that endangered the empire. Possessed immense power, as he controlled the administration of the Seljuk Empire for thirty years. Was strongly dedicated to Sunni Islam and severely suppressed heterodox religious movements, particularly the Shiis and the Ismailis. Established the Nizamiyyah madrasas, hospitals, and extensive public works. Was killed, allegedly by an Ismaili.