 Although we have just referred to Plato, the term “idealism” became the name for a whole family of positions in philosophy only in the course of the eighteenth century. Even then, those whom critics called “idealists” did not identify themselves as such until the time of Kant, and no sooner did the label come into use than did those to whom it was applied or who used it themselves attempt to escape it or refine it. As already mentioned, Berkeley, the paradigmatic idealist in the British tradition, did not use the name for his own position, which he called rather immaterialism; and Leibniz, at least some versions of whose monadology might be considered idealist, also did not call his position by that name. Rather, in contrasting Epicurus with Plato, Leibniz called the latter an idealist and the former a materialist, because according to him idealists like Plato hold that “everything occurs in the soul as if there were no body” whereas on the materialism of Epicurus “everything occurs in the body as if there were no soul” (“Reply to the Thoughts on the System of Pre-established Harmony contained in the Second Edition of Mr. Bayle’s Critical Dictionary, Article Rorarius”, 1702, PPL: 578), although in this text Leibniz also says that his own view combines both of these positions. It seems to have been Christian Wolff who first used “idealism” explicitly as a classificatory term. Wolff, often considered the most dedicated Leibnizian of his time (although in fact his position was more eclectic than at least some versions of Leibniz’s) set out to integrate the terms “idealism” and “materialism” into his taxonomy of philosophical attitudes of those “who strive towards the knowledge and philosophy of things” in the Preface to the other [second] Edition of his so-called German Metaphysics [Vernünfftige Gedancken von Gott, der Welt und der Seele des Menschen, auch allen Dingen überhaupt, den Liebhabern der Wahrheit mitgetheilet (Halle: Carl Hermann Hemmerde, 1747)]. Wolff distinguishes between two basic attitudes, one of which he sees exemplified by the skeptic, the other by what he calls “the dogmatist”. The skeptic doubts the possibility of knowledge in general and thus refuses to defend any positive claim at all. By contrast, the dogmatist puts forward positive doctrines, and these can be divided into those which posit as fundamental either one single kind of entities [Art der Dinge] or two different kinds. Wolff names the supporters of the first position “monists” and the adherents of the second “dualists”. This amounts to the division of all dogmatic doctrines, i.e., all knowledge-claims with respect to the ultimate constitution of reality, into monistic and dualistic theories. Here is where the term “idealist” then makes its appearance in Wolff’s typology: he distinguishes within the monists between idealists and materialists. Idealists “concede only spirits or else those things that do not consist of matter”, whereas materialists “do not accept anything in philosophy other than the corporeal and take spirits and souls to be a corporeal force”. Dualists, on the contrary, are happy “to accept both bodies and spirits as real and mutually independent things”. Wolff then goes on to distinguish within idealism between “egoism” and “pluralism”, depending on whether an idealist thinks just of himself as a real entity or whether he will allow for more than one (spiritual) entity; the first of these positions would also come to be called solipsism, so that solipsism would be a variety of (ontological) idealism but not all idealism would be solipsism.