The past few decades have seen a considerable revival in virtue ethics and, to a lesser extent, natural law theory. Alasdair MacIntyre is among those at the forefront of this development. His own conception of ethics has changed significantly over time, becoming more metaphysical and classically Thomistic. Nevertheless, the foundations of MacIntyre's ethics remain insufficient, in large part because he makes epistemology prior to metaphysics. MacIntyre's ethical philosophy is a corruption of the theory provided by Aquinas, rather than a legitimate development and improvement upon it.