This volume collects ten revised and translated essays by Bruno Centrone, one of Italy's leading scholars of ancient philosophy. Together they trace a rich and coherent intellectual narrative from Plato's metaphysics, ethics, and psychology to their reinterpretation to later Pythagoreanizing writings. Centrone's studies combine meticulous philological accuracy with philosophical depth, shedding new light on Plato's conception of truth, being, virtue, and the soul, as well as on the complex processes through which later thinkers reshaped Platonic doctrines. A particular strength of the book lies in its treatment of post-Hellenistic pseudo-Pythagorean texts, for which Centrone's work remains foundational. By collecting and making these landmark studies available in English, this volume provides an essential resource for scholars, graduate students, and libraries, and a crucial bridge between Italian and anglophone traditions of scholarship on ancient philosophy.