Hieronymus Rorarius (Girolamo Rorario), (Pordenone 1485-Pordenone 1556) was at first an envoy on behalf of Charles V of Habsburg, and then a Papal nuncio to the court of Ferdinand of Hungary. In a 1544 pamphlet, Rorarius maintained that animals make better use of reason than men do. [1] After Gabriel Naudé republished the book in 1648, it was reprinted several times, and discussed at length by Pierre Bayle's entry Rorarius in his Historical and Critical Dictionary , where it introduced a critical discussion of the nature of the soul and of Descartes's and Leibniz's philosophies. [2]