On the 28th of October this commission was discharged and Franklin was appointed sole plenipotentiary to the French court.
In 1679 Gyllenstjerna was appointed the Swedish plenipotentiary at the peace congress of Lund.
In 1660 he was sent as plenipotentiary to a second congress, to convert the truce of 1658 into a permanent peace.
Before this work had been completed he was again sent to Europe, having been chosen on the 27th of September 1779 as minister plenipotentiary for negotiating a treaty of peace and a treaty of commerce with Great Britain.
As a state of the empire, Hamburg is represented in the federal council (Bundesrat) by one plenipotentiary, and in the imperial diet (Reichstag) by three deputies.