Bertrand Haan, former member of the Casa de Velázquez in Madrid, is assistant professor at Sorbonne University. He has studied diplomacy in early modern period mainly through the Spain–France relationship: negociations and peace practices and imaginary (Une paix pour l’éternité. La négociation du traité du Cateau-Cambrésis, 2010, and with L. Bély and Stéphane Jettot, La paix des Pyrénées, 2015), and the friendly nature of the political links before the advent of the Nation-States (L’amitié entre princes. Une alliance franco-espagnole au temps des guerres de Religion, 1560–1570, 2011). He has recently coordinated a special issue the review Histoire, Économie & Société entitled La monarchie espagnole du XVI^e au XVIII^e siècle. De l’anomalie au modèle (September 2019).