 From 1643 he was preparing the peace negotiations at Osnabrück, as a second man behind Johan Oxenstierna, as Christina wanted peace at any cost, and therefore sent her own delegate.When it became clear Johan Oxenstierna was not capable to fulfill his task neither diplomatic nor mentally, Salvius managed to push through the view of Queen Christina.In 1648 Salvius considered it “a great miracle that we hear of revolts by the people against their rulers everywhere in the world, for example in France, England, Germany, Poland, Muscovy, and the Ottoman Empire,” and wondered “whether this can be explained by some general configuration of the stars in the sky.” In 1650 he went back to Stockholm.