“…The history of the teaching of modern natural law at the University of Pisa1 formally started in 1738, during the rule of the new Grand Duke Francis Stephen Habsburg-Lorraine, with the reinstatement in the 'collegio dei giureconsulti' of the 'jus publicum' chair.2 Only then, while reorganizing the teaching plan, was the chair equated with a chair of 'diritto della natura e delle genti' (law of nature and nations), and lessons on this subject began to appear in printed schedules. 3 However, on the basis of what happened at the universities in the Germanic area,4 and the explicit reference in the acts establishing this second chair of public law,5 the history of the teaching of modern natural law has been conventionally considered as starting with the institution of the first chair of 'jus publicum' , in 1726.6 The first chair of public law in Italy was indeed founded at the time of the government of the last Medici Grand Duke, Gian Gastone, during the dynastic crisis of the reigning family and the related international dispute between the Grand Duchy and the Holy Roman Empire: a bellum diplomaticum that, throughout the first decades of the eighteenth century, engaged the Tuscan ruling class and its jurists in defending the autonomy and independence of the Tuscan 'small state' against imperial expansion .7 However, the absence of the contents of the lectures given by the first teacher of the course (the abbot jurist Pompeo Neri, in the chair from 1727/1728 to 1728/1729) has compelled scholars to undertake an indirect institutional reconstruction, focusing at best on the bellum litterarium regarding the origin of the mythical Littera Pisana/Florentina of the Digest during the late 1720s .8 Nevertheless, the presence of numerous primary sources makes it possible to reinterpret the establishment of the first public law chair as a terminus ad quem of an earlier process. Indeed, a process of gradual introduction and use of modern natural law by Pisan academics, from the end of the seventeenth century, is demonstrated not only by funeral orations dedicated to the main law professors (often the only sources used by historians for their accounts), but also by many neglected sources, such as library catalogues, judicial decisions and legal consultations, as well as government booklets.…”