 The saying “dîn and mulk are twins” in reference to the prophet and the king empowered to perform the functions of the imâm in the sense preached by the Ikhwân perfectly fits the Fatimid rulers. If this hypothesis is tenable, the debated “traditions” mentioned in Epistle 31 with reference to the misunderstandings due to the diversity of languages might be understood as the Fatimid versions of the divine Law. If the Ikhwanian “Lawgiver” is identified with the historical incarnation of the Isma‘ili faith, that is, with the Fatimid caliph, and if the “perfect city” is the one ruled by these caliphs, then the Ikhwân al-Safâ’ are his du‘â’. Epistle 48, with the mention of the term da‘wa in the title, might further support the hypothesis of a project of concrete militancy by the Ikhwân.