The book "On the method of negotiating with princes. On the use of diplomacy; the choice of ministers and ambassadors; and the personal qualities necessary for success in foreign missions" by the famous author Monsieur de Callières (Francois) is a classic work that deals with the complex aspects of diplomacy and the conduct of international relations . The book examines in detail the strategies and tactics of interaction with princes, the selection of the right agents for the execution of ambassadorial missions, as well as personal traits that help to succeed in work abroad. This book is an important source of knowledge for those interested in public policy, international relations, and diplomacy.