Dustūr al-Munajjimīn (‘canon of the astronomers’) was written ca. 500/1106 in the fortress of Alamūt (cf. Blochet, Catalogue, 151; Qazwīnī, ‘Dustūr’, in Yāddāsht-hā, 8/110–143; Zimmermann, 184–192). It is the only text remaining from the era of Ḥasan-i Ṣabbāḥ (d. 518/1124), the Nizārī Ismaili leader and founder of the Nizārī state of the Alamūt period. It is written in Arabic and discusses astronomy, astrology and history in three parts which are further divided into a total of ten sections or maqālas (see Casanova, 126–135; Blochet, ‘Notes’, 385; Karimi, Dār al-ʿIlm, 120–124; idem…