Short answers, pulled from the story.
The Republic of Letters was a long-distance intellectual community in the late 17th and 18th centuries, spanning Europe and the Americas. It connected scholars and philosophers across national borders primarily through handwritten correspondence, forming the intellectual backbone of the Age of Enlightenment.
Francesco Barbaro first used the Latin phrase Respublica literaria in a letter to Poggio Bracciolini, dated the 6th of July, 1417. Pierre Bayle later translated the term into French in his journal Nouvelles de la Republique des Lettres in 1684.
Isaac Newton served as president of the Royal Society from 1703 until his death in 1727. The Royal Society, which had been preceded by the Invisible College, played an international role in adjudicating scientific findings and published the journal Philosophical Transactions of the Royal Society, edited by Henry Oldenburg.
The Republic of Letters consisted mostly of men because of societal constraints on women. Historians Dena Goodman and Susan Dalton have argued that women did play a role in the Enlightenment despite these exclusions, and the question of their participation remains an active subject of historical debate.
According to historian Anne Goldgar, the most important shared concern among members in the transitional period between the 17th century and the Enlightenment was their own conduct. Shared codes of civility and polite exchange mattered more to members than agreement on ideology, religion, or scientific strategy.
After 1770, a radical critique inspired by Rousseau emerged in French salons, with critics denouncing the mechanisms of polite sociability that had defined the Republic. These radicals called for a new model of the independent writer who would address the public and the nation directly, rather than correspond within a closed gentlemen's network.