Gottfried Wilhelm Leibniz (1646-1716), one of the most prominent figures in both the history of philosophy and the history of mathematics, but also one of the greatest advocates of Christian unity of the early modern period, may just have the solution to divisions within the Church with his unique understanding of the nature of the Church. Leibniz's unique theological metaphysics and pioneering thought on the centrality of the concept of person, makes his ideas on the nature of the Church particularly promising. The book presents how Leibniz's ideas are formed by history and meetings with extraordinary figures, and how these ideas mature and develop through time into a theological-metaphysics, and much later as a philosophy of personalism that secures Leibniz's place as an early pioneer of the philosophical movement of personalism. Leibniz on the Nature of the Church presents a historical, systematic, and provocative reading of these (until now) overlooked ideas.