ABSTRACT This article analyses the abbé de Saint-Pierre as a mediator of ideas between France and England. The political proposal of the Projet pour rendre la paix perpétuelle en Europe circulated in Great Britain just before the signing of the peace treaties of Utrecht and Aachen, attesting the influence that Saint-Pierre’s proposal exerted on British thought and politics. The abbé was engaged in dialogue with Quaker pacifists and, in particular, with the projects put forward by William Penn and John Bellers, (...) both theorists of a ‘European State’. After examining the relationship between Penn’s Essay and Saint-Pierre’s ideas, the article will demonstrate how elements of Bellers’s Some Reasons found their way into the Projet with numerous convergences of lexicon and content suggesting that the abbé had drawn inspiration from Bellers. Quaker ideas on politics had a greater effect on Saint-Pierre’s conception of peace and international relations than is commonly recognized. In fact, there was a constant intellectual exchange between the abbé and British political, economic and philosophical thought. (shrink)