One of the most riddling of all literary genres is that which is called tragedy. The term "tragedy" has been used to describe all sorts of serious literature, of varying degrees of excellence, throughout the artistic history of Western man. However, to the ancient Greeks, who invented the genre, tragedy had distinct and highly refined characteristics of composition. It was a particular art after a recognizable pattern. The pattern of tragedy was analyzed by Aristotle in his Poetics, in which the Greek philosopher based his discussion on the works of the three masters of Greek tragedy, Aeschylus, Sophocles, and Euripides. The essential principles of the Aristotelian definition, crucial of a development of any understanding of the art of trag...