Taḥrīr kitāb uṣūl al-handasah wa-al-ḥisāb تحرير كتاب أصول الهندسة والحساب Euclid أقليدس Ṭūsī, Naṣīr al-Dīn Muḥammad ibn Muḥammad طوسي، نصير الدين محمد بن محمد	The copy was completed on 15 Rabī‘ II 656/21 April 1258 by an anonymous scribe. Although al-Ṭūsī did not die until 1274, the scribe clearly believed he was already dead as indicated by the use of the phrase "may God sanctify his soul and illuminate his tomb" قدس الله روحه ونور ضريحه