"It is difficult to find in the history of philosophy a man presenting a variety and richness of thought as Plato offers us in his works; it converge and all creations of the spirit of the V and VI centuries, philosophy, art and religion come together. Still, this union could not be complete, since, due to its rich sensitivity, rooted in him tendencies truly contradictoriasentre yes. "With these words, Giorgio Colli began his first work, that political Plato who later would lead to doctoral thesis. -we Have only twenty years in 1937, but is not afraid to face, so soon, with one of the major themes in the history of ancient philosophy, and point the way that aims to go: "A single solution seems to present critical: interpreting Plato historically, that is, to explain apparent contradictions as successive stages of spiritual development. " And in the following pages, amazing for thoroughness and maturity of his thought, resounds and the unmistakable timbre that is shaped argue Colli and a tour of the utmost importance, in which theoretical research is inseparable from the draw philological-historical research.