 Al-Kindī (d. after 870) engaged in a taxonomic approach to Aristotle’s corpus, on the basis of a number of unidentified Greek sources of Neoplatonic heritage (Treatise on the Quantity of Aristotle’s Books and What is Required to Attain Philosophy, Risāla fī kammiyyat kutub Arisṭāṭālīs wa-mā yuḥtaǧu ilayhi fī taḥṣīl al-falsafa). In this treatise, he expresses an ambivalent view of the place of the Metaphysics in the corpus, by presenting Aristotle’s work as the culmination of a four-fold division of philosophy into mathematics, logic, physics, and metaphysics, but also as preliminary to the knowledge of ethics. The description of the content of the Metaphysics is limited to the part of this work dealing with philosophical theology (the study of immaterial things), and contains explicit references to Islamic tenets such as God’s oneness, the divine names, and providence.