RT Article T1 Metaphysics, Elemental Transformation, Medicine: A Specimen of Avicenna’s System of Thought in Ms. Escorial 621 JF Oriens VO 47 IS 3/4 SP 389 OP 417 A1 Bertolacci, Amos LA English PB Brill YR 2019 UL https://ixtheo.de/Record/1821438051 AB Abstract The present article brings to the scholarly attention the Avicennian manuscript San Lorenzo de El Escorial (Madrid), Real Biblioteca del Monasterio de San Lorenzo de El Escorial, 621, by conveying a basic description of its codicological features and by locating it in the wider context of the connection metaphysics-medicine that the transmission of Avicenna’s magnum opus Kitāb al-Šifāʾ (Book of the Cure/Healing) displays. The manuscript at stake is the only extant, though incomplete, codex of the Ilāhiyyāt (Science of Divine Things) of Avicenna’s Šifāʾ presently known in the Iberian peninsula (Spain and Portugal), and one of the few codices of the Šifāʾ housed there. In its present state, it cumulates metaphysics and medicine, since it joins some excerpts of the Ilāhiyyāt with fragments of the commentaries on Avicenna’s Al-Qānūn fī l-ṭibb (Canon of Medicine) by Ibn al-Nafīs al-Qurašī (d. 687 H/1288) and by Quṭb al-Dīn al-Šīrāzī (634–719 H/1236–1311). The part of the commentary on Avicenna’s Canon by Ibn al-Nafīs al-Qurašī preserved in this manuscript contains a revealing critical quotation of a medical tenet which Avicenna discusses in the Šifāʾ; this criticism very likely represents an instance of the ‘rectification’ of Avicenna’s philosophical encyclopedia of which Ibn al-Nafīs is credited in historical sources. The example of the revision of Avicenna’s philosophy by Ibn al-Nafīs analyzed on the basis of this manuscript makes clear that physicians in the XIII century did not limit their familiarity with Avicenna’s works to the Canon of Medicine and the other medical works of Avicenna, but adopted some kind of all-encompassing approach to Avicenna’s oeuvre, which did not eschewed tackling critically also the Šifāʾ on the basis of a profound and extensive knowledge of the Šayḫ al-raʾīs’s philosophical masterpiece. K1 Manuscripts K1 Quṭb al-Dīn al-Šīrāzī K1 Ibn al-Nafīs al-Qurašī K1 Qānūn fī l-ṭibb K1 Kitāb al-Šifāʾ K1 Avicenna K1 history of Arabic medicine K1 history of Arabic philosophy DO 10.1163/18778372-04701600