In the Western tradition, "Medieval Philosophy" refers to the period after Ancient Philosophy, but before Renaissance Philosophy. There are no exact dates delimiting the period, but many would roughly estimate it as running from after 400 AD until the late 1300s AD. Some of the key philosophers of this period include Augustine, Boethius, Anselm, Peter Abelard, Thomas Aquinas, Duns Scotus, and William of Ockham. Also included is Jewish thinker Moses Maimonides and members of the Islamic tradition such as Averroes and Avicenna. The period is dominated by religious questions, and with reconciling the claims of religion with those of the gradually rediscovered Ancient philosophers, especially Aristotle. Key questions in Metaphysics and Epistemology, such as the so-called "problem of universals" played a major role in this period. See also: Medieval Philosophers.