This book deals with Aristotle's lost dialogue On Poets, the content of which it attempts to reconstruct through testimonies and fragments. A valuable aid in this endeavour is the Poetics of the Philosopher, which is considered to be dealing with similar issues. Throughout this study, light is shed on intractable concepts in Poetics, such as that of catharsis and mimesis, while at the same time the Aristotelian definition of tragedy is being analyzed.