Tragedies frequently focus on a tragic hero that has a flaw that ultimately leads to his downfall. That flaw is commonly referred to as a tragic flaw that is inborn to the person and can reflect his background. In Aristotle's Poetics, he discusses the theory of tragedy and what criteria is essential in an ideal tragedy. According to Aristotle, the tragic flaw is the most important part of the hero and the events that occur in the work is a reflection of that flaw. A tragic flaw is essential in a true tragedy. In William Shakespeare's Othello, Othello is a prime example of an Aristotelian tragic hero. His gullibility and jealousy are the main reason of his downfall. Othello deals with love lost because of gullibility and jealousy. Aristotle's theory of tragedy, found in the Poetics, deals with the characteristics of plays that make them a true tragedy. Those characteristics are essential in giving a play its true definition. According to Aristotle, the life and soul of tragedy is plot. Incidents in the plot have the best effect if they occur unexpectedly, and in consequence of one another. A great tragedy grips the audience with the plot. Aristotle also states that the sense of the inevitable must be present in tragedy. The tragic hero is also another important factor in an Aristotelian tragedy. The central character must be noble and have a higher stature than most men. The tragic hero must also have better qualities than secondary characters but must also exhibit flaws. The most important part of an Aristotelian tragic hero is the tragic flaw. The flaw is inborn to the person. He must have that flaw throughout his life and it will play the primary role in his downfall. The flaw can also reflect the tragic hero's background. Another part of the central character is that he is destroyed by himself, not by others, bad luck, or depravity. These are the criteria necessary to be classified as a ideal tragedy.