Stefan Alexandru, D. Phil. (Oxford 2002), University of Heidelberg, is Visiting Scholar at the Classics Department of Harvard University. He has published books and articles on Aristotelianism and on topics of textual transmission including ‘A New Manuscript of Pseudo-Philoponus’ Commentary on Aristotle’s Metaphysics Containing a Hitherto Unknown Ascription of the Work’ (Phronesis, 1999).

In this annotated critical edition of Aristotle’s Metaphysics Lambda Stefan Alexandru explores and utilizes for the first time numerous previously neglected textual sources, written in Greek, Latin, Arabic, and Hebrew. The twelfth book of the Metaphysics, originally an independent treatise, is crucial for the understanding of Aristotle’s philosophy, primarily because the doctrine of the Unmoved Mover is nowhere else set forth in greater detail.

Not only all the forty-two formerly known Greek codices have been collated, but also commentaries and translations. Moreover, a hitherto undiscovered, independent manuscript, representing a tenuous and particularly valuable branch of the direct tradition, is minutely investigated. The document in question, preserved in the Vatican, is an autograph of the Byzantine humanist and Ecumenical Patriarch Gennadios II Scholarios.