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al-ṭūsī, Nasīr al-Dīn

al-Ṭūsī, Nasīr al-Dīn (1201–74 (AH 598–673)). Shiʿite scholar and theologian. Born in Ṭūs (hence the name), he worked under an Ismāʿīlī ruler in Alamūt (the centre for the Assassins), and wrote Ismāʿīlī works of accepted and great authority, but his own personal allegianace is uncertain. He compiled the astronomical tables known as Zīj al-Khānī, and introduced into astronomy ‘the Ṭūsī couple’. Writing on virtually all subjects, his most enduring works were al-Akhlāq al-Nāsiriyya (1235, The Nasiriyyan Ethics) and Tajrīd al-Iʿtiqādāt (The Definition of the Articles of Faith).

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