 Anselm, Saint [Anselm of Bec, Anselm of Canterbury] |  Aquinas, Thomas |  Descartes, René |  Descartes, René: epistemology |  Descartes, René: life and works |  Descartes, René: modal metaphysics |  Elisabeth, Princess of Bohemia |  existence |  Kant, Immanuel |  ontological arguments |  Russell, Bertrand 