Full context:   According to Aristotle, there are four species of tragedy: G.W.F. Hegel, the German philosopher most famous for his dialectical approach to epistemology and history, also applied such a methodology to his theory of tragedy. In his essay "Hegel's Theory of Tragedy," A.C. Bradley first introduced the English-speaking world to Hegel's theory, which Bradley called the "tragic collision", and contrasted against the Aristotelian notions of the "tragic hero" and his or her "hamartia" in subsequent analyses of the Aeschylus' Oresteia trilogy and of Sophocles' Antigone. Hegel himself, however, in his seminal "The Phenomenology of Spirit" argues for a more complicated theory of tragedy, with two complementary branches which, though driven by a single dialectical principle, differentiate Greek tragedy from that which follows Shakespeare. His later lectures formulate such a theory of tragedy as a conflict of ethical forces, represented by characters, in ancient Greek tragedy, but in Shakespearean tragedy the conflict is rendered as one of subject and object, of individual personality which must manifest self-destructive passions because only such passions are strong enough to defend the individual from a hostile and capricious external world: