Metaphysics (τὰ μετὰ τὰ φυσικά, "things after the ones about the natural world"; Latin: Metaphysica) is one of the principal works of Aristotle, in which Aristotle develops the doctrine that he refers to sometimes as Wisdom, sometimes as First Philosophy, and sometimes as Theology. It is one of the first major works of the branch of western philosophy known as Metaphysics.