Stucked between France and Spain, the House of Savoy unwillingly finds herself at the heart of European wars. Between 1643 and 1697, the dynasty is invited to take part in congresses that put an end to these wars. The house of Savoy sends sometimes ambassadors and plenipotentiaries, sometimes agents with an unofficial status, that European powers seem to keep out of the peace process. Whatever their character, these diplomats were unable to take part in, or object to, talks that the allied delegations did not always bring back to them. With the support of diplomatic correspondence - instructions, letters and memoranda - the aim of this article is to show that this diplomacy on the fringes of the congresses, from their preliminaries to the peace treaties, enabled this second-rate dynasty to assert itself within the Society of Princes.