This third and final volume gathers the Proceedings of the conference dedicated to the history of Proclus' Elements of Theology and of the Book of Causes, which was co-organised (within the framework of the project liber anr-13pdoc-0018-01) with the much-regretted Marc Geoffroy in Paris, on 14, 15 and 16 April 2016. I am most grateful to the collaborators of this volume, and of the others as well, who manifested patience and understanding, waiting, in this case, for five years to see their

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... ibutions published. I am most grateful to those who accepted to join the volume, although they did not (could not) deliver them in person: Levan Gigineishvili, Jonathan Greig, Ezequiel Ludueña, Bethany Somma, Ilaria Ramelli. The final preparation for the publication was accomplished as part of the larger erc project NeoplAT erc_CoG_771640. It is my renewed pleasure to thank the institutions that served as the venue for this conference, hosting over sixty scholars for seven days, all devoted to study the reception of Proclus and the Book of Causes: École pratique des hautes études, Équipe "philosophie arabe" of the Centre "Jean Pépin"-cnrs (umr 8230), Laboratoire d'études sur les monothéismes-cnrs (umr 8584), Labex haStec (Laboratoire européen d'histoire et anthropologie des savoirs, des techniques et des croyances), Institut de recherche et d' histoire des textes-cnrs, Centre "Pierre Abélard"-Université Paris Sorbonne. The anr project liber which I directed between 2013 and 2016 at the École pratique des hautes études enabled me not only to learn from the extraordinary colleagues and masters that accompanied this project, but also to gather energy, resources and ideas until this day-and even for a longer period. The same anr project and the warm reception from Brill, notably through Jennifer Pavelko, enabled me to publish the three volumes through Open Access, and assure their wide diffusion as an act of gratitude for the publicly funded research projects by the French Government. May Liz Curry, who helped me considerably in preparing this volume, find here my most sincere and renewed gratitude, and Robert Berchman and John F. Finamore for accepting the publication of the three volumes in their series. Marc and I invited our colleagues to study two major doctrinal topics, causality (notably on One and participation, and on causality and free will) and the triad being-life-intellect, but each author freely chose their research theme. In