Avicenna's Metaphysics (in Arabic: Il©Øhiyy©Øt) is the most important and influential metaphysical treatise of classical and medieval times after Aristotle. This volume presents studies on its direct and indirect influence in Arabic, Hebrew, and Latin culture from the time of its composition in the early eleventh century until the sixteenth century. Among the philosophical topics which receive particular attention are the distinction between essence and existence, the theory of universals, the concept of God as the necessary being and the theory of emanation. It is shown how authors such as Averroes, Abraham ibn Daud, Albertus Magnus, Thomas Aquinas and John Duns Scotus react to Avicenna's metaphysical theories. The studies also address the philological and historical circumstances of the textual tradition in three different medieval cultures. The studies are written by a distinguished international team of contributors, who convened in 2008 to discuss their research in the Villa Vigoni, Italy.