Philosophical Theology among Sixth/Twelfth-Century Twelver Shīʿites: From Naṣīr al-Dīn al-Ṭūsī (d. after 599/1201-2 or 600/1202-3) to Naṣīr al-Dīn al-Ṭūsī (d. 672/1274): A Critical Edition of Two Theological Tracts, Preserved in MS Landberg 510 (Beinecke Rare Book and Manuscript Library, Yale University)

MS Yale, Landberg 510, a multitext volume, contains unique copies of two doctrinal works composed as it seems by an Imāmī scholar of the sixth/twelfth century, ʿAbd Allāh b. Ḥamza b. ʿAbd Allah b. Ḥamza al-Ṭūsī al-Mashhadī al-Shāriḥī al-maʿrūf bi-Naṣīr al-Dīn al-Ṭūsī, al-Wāfī bi-kalām al-muthbit wa-l-nāfī and al-Masʾala fī tanzīh dhāt al-khāliq ʿan al-talawwuth bi-waṣmat al-fanāʾ wa-l-ʿadam. Both tracts show the author’s close familiarity with the doctrinal systems of the followers of Abū Hāshim al-Jubbāʾī (d. 321/933) on the one hand and Abū l-Ḥusayn al-Baṣrī (d. 436/1044) on the other. The discussions revolve around the contested Bahshamite notion that the “non-existent” (maʿdūm) is a “thing” (shayʾ), as well as the related doctrine that essences (dhawāt, sg. dhāt) are “real” or “actual” (thābit) in the state of non-existence (ʿadam). The paper introduces the author and the two tracts and provides critical editions.