The cosmological revolution of the seventeenth century saw the establishment of physics and astronomy as autonomous spheres. The Ptolemaic universe was a hierarchy of dignity – sun and stars above, lowly earth at the bottom – supported by a hierarchy of disciplines that set theology and metaphysics at the apex of intellectual life. The advancing belief in heliocentrism that undid the first was paralleled by challenges to the second, starting with the humanist celebration of rhetoric and moral philosophy and carried further by Copernicus’s exaltation of astronomy, hitherto assigned the lowly place of a mere computational aid, as a source of truth. The authority of the Church was often restricted by political and cultural divisions, so that many heretical ideas could not be stamped out, and Galileo long found support from Jesuits and even the pope. As he lost it, he sought backing in a wider audience, publishing his writings in Italian rather than Latin, and in a popular style. Newton and his followers would similarly seek to substitute horizontal connections for the vertical ones around which intellectual life had long been organized, demonstrating elements of their theories to popular audiences and explicitly describing the kind of science they favored as “public.”

Building on their training and contacts, Iberian men of letters such as Nogueira widened their intellectual horizons. Amid a period of relative peace known as the Pax Hispánica (1601–1621), the expertise of such figures in historical writing was solicited by members of the Republic of Letters interested in Iberian matters. Such intellectual correspondences gave way to debates on politics of conversion and tolerance and the relationship between royal and ecclesiastical power. In the meantime, someone like Nogueira specialized in historical matters and became a source of information for foreign intellectuals who worked on behalf of French, Italian, English, and other powers. This process of specialization fueled the critical political sense of Nogueira while bringing him increasing attention from admirers and critics. At the core of his self-fashioning strategy, Nogueira’s library became a proxy by which he and his critics came to define his status as a mercenary of knowledge. As this status started to become more evident, so too did a strengthening sense of belonging to a mercenary republic.

This chapter examines the motivations for and practices of library formation, development and management exercised by the Spalding Gentlemen’s Society (SGS), Britain’s oldest provincial learned society and second oldest museum. It contends that civic philanthropy in the form of library formation served as a core activity for SGS members throughout the first fifty years of the Society’s history, and as a key component of the society’s raison d’être. The SGS’s extensive archival and bibliographical holdings provide a means of examining the modes of acquisition, cataloguing and circulation of the three libraries under the SGS’s management in the period 1710–1755: the parish library of St Mary and St Nicolas, the library of Spalding Grammar School, and the library housed in the SGS museum. Spalding’s libraries provide a composite case study that reveals the interconnection of individual and institutional forms of philanthropy at work in eighteenth-century libraries. At the same time, the SGS emerges as a precursor of the later eighteenth-century subscription libraries and literary and philosophical societies that engaged in library formation as a means of fostering sociability, education, improvement and intellectual exchange in local communities throughout Britain.

This chapter introduces Part II, on Pierre Bayle. It provides an intellectual-biographical account of Bayle’s career, emphasising both his deep immersion in circles of Reformed scholars and theologians, and the reactive dimension of his writing, which were almost always shaped by his most recent reading. It urges caution about trying to find a coherent system in all of Bayle’s writings, and instead presents a framework for a developmental account of his thought. It also introduces the historiographical debate about Bayle, and the so-called ‘Bayle enigma’. It suggests that that enigma can be dissolved even if we carefully place Bayle in his own context, and avoid misleading categories such as ‘scepticism’ and ‘fideism’.

The Introduction offers a contextual framework for exploring aspects of eighteenth-century thought. In the first section, ‘Ideas and their history’, the question of how to approach the ways of thinking that animated English-speaking peoples some three centuries ago is briefly considered. This is followed by an outline of how knowledge was structured in the eighteenth century, particularly as this is reflected in the pioneering encyclopedias of the period, such as Ephraim Chambers’s Cyclopédia and the French Encyclopédie. The limitations of attempts to label the prevailing intellectual ethos of the period (Age of Reason, of Revolutions, of Enlightenment, of secularization, of progress) or to define its temporal limits (the ‘long’ eighteenth century) are next considered. The introduction concludes with a discussion of the institutional framework and social habits—elements of the sociology of knowledge—that structured intellectual inquiry in the eighteenth century. A short appendix of terms highlights differences between the meanings of key words in the eighteenth and the twenty-first centuries: how they were understood and used then, in contrast with their meaning for us now.

The knowledge commons framework, deployed here in a review of the early network of scientific communication known as the Republic of Letters, combines a historical sensibility regarding the character of scientific research and communications with a modern approach to analyzing institutions for knowledge governance. Distinctions and intersections between public purposes and privacy interests are highlighted. Lessons from revisiting the Republic of Letters as knowledge commons may be useful in advancing contemporary discussions of Open Science.