"The development of foreign ministries further restricted the scope for summitry. But rulers often retained their own private diplomatic networks. Louis XV was a prime example, while Frederick the Great of Prussia created his own Kabinett, or private office, and took over the most important business from the Foreign Office. Not surprisingly, Frederick also tried his hand at summitry: seeking a rapprochement with Austria after the Seven Years War, he met the emperor Joseph II at Neisse in 1769 and Neustadt in 1770."
January 1, 1970
https://en.wikiquote.org/wiki/Frederick_II_of_Prussia