The book “Congress of Troppau 1820 and the Politics of the Holy Alliance between Times” also includes the chapter “On the Congress of Troppau [Opava], or When Reason, Justice and Humanity Do Not Rule. The Accuser Baron Bignon, the Tribune of European Constitutionalism”. The object of interest is the French baron Louis-Pierre-Édouard Bignon (1771–1841), the famous tribune of European constitutionalism, a critic of the conservative and “congress” politics of the Holy Alliance. He was the author of the first theoretical analysis reflecting the results of the proceedings of the Troppau Congress of the Holy Alliance from 1820. The chapter deals with the core ideas of Bignon's book „Du congrès de Troppau ou Examen des prétentions des monarchies absolues à l’égard de la monarchie constitutionnelle de Naples“ [About the Congress of Troppau, or a Review of the Claims of Absolutist Monarchies Against the Constitutional Monarchy in Naples] and analytically evaluates the image of the Congress in Opava (Troppau) in Bignon's view. Author analyses Bignon's ideological starting points or motives for writing this book.