What difference between cyrenaics and epicureans? Did Pythagoras really let himself be killed for refusing to walk on beans? What are the definitions of happiness and wisdom according to Aristippe, Zeno, Epicurus and Pyrrhon? From the founders of philosophy to the cynical philosophers, to the stoicians and pythagoricians, Diogene Laërce, of which we know little, except that he would have been born between 200 and 500 after our era, we read here his history of Greek philosophy, combining anecdotal richness and precision of the trait.