International law and its science, 1789-1914

Project leader: Prof. em. Dr. Dr. h.c. mult. Michael Stolleis

The project examined paradigmatic changes in legal structures in international relations in the 19th and early 20th centuries. Both international law practice and international law scholarship were of interest. The aim was to understand international law as a separate type of normative order in an interdisciplinary research context and to analyze its historical structural features: What goals and values constituted international law in the 19th century? Who were the actors and what legal instruments did they use? In what form did global norms and orders become universalized?

As a result, it emerged that international structures underwent a remarkable development during the research period: Between the end of the Ancien Régime and the outbreak of the First World War, international law developed from a law of coexistence to a law of cooperation. New international regimes were established to regulate diverse political, social and economic interests, and relations between states became more legalized; at the same time, however, there were also areas in which legal avoidance dominated (sovereign debt; right of intervention). Principles that are still valid today, such as the fundamental rights of states or the international community, emerged. Intergovernmental organizations began to shape international relations. In the process, both a separation of international law from morality and the adoption of fields of activity that signify a “moralization” of law can be observed.

This change in the practice of international law was accompanied, promoted and reflected by numerous scholars of international law. In addition to individual authors, of whom Georg Friedrich von Martens, Theodor Schmalz, Julius Schmelzing, Friedrich Saalfeld, Carl Baron Kaltenborn von Stachau, Robert von Mohl, Henry Wheaton, August Wilhelm Heffter, August von Bulmerincq, Carl Bergbohm, Johann Caspar Bluntschli, Leopold Neumann, James Lorimer, William Edward Hall, Fedor Fedorowitsch von Martens, Carlos Calvo, Henry Bonfils, Franz von Liszt, John Westlake, Frantz Despagnet and Lassa Oppenheim should be mentioned, the founding of the Institut de Droit International in particular testifies to the importance and influence of science on the newly invented system of international law.

A particular concern of the project group’s research was the analysis of the academic accompaniment of the juridification process by the authors of international law and political science: they commented on the institutionalizations that took place in the course of the 19th century and accompanied the processes of negotiating an international normative order in their contemporary interpretations and historical narratives. In doing so, they often developed affirmative, rarely alternative concepts of order. The question of universalist claims to justice in a world order, whether based on the morality of nations or the demand for equal treaties through to the resolution of state bankruptcies, which took place in and through international law, emerged as an aspect of this, as did the emergence and establishment of general legal principles of international law, taking into account contemporary academic discourse.

The results are available in the form of several monographs and anthologies. The most important of these include
Nuzzo, Luigi/Vec, Miloš (eds.) (2012): Constructing International law – The Birth of a Discipline (Studien zur europäischen Rechtsgeschichte 273), Frankfurt/M.: V. Klostermann, XVI, 545 pp.
Heimbeck, Lea (2013): The resolution of state bankruptcies in international law. Legalization and legal avoidance between 1824 and 1907 (Studies in the History of International Law), Baden-Baden: Nomos.
Stefan Kroll (2012): Norm genesis through re-interpretation. China and European international law in the 19th and 20th centuries (Studies in the History of International Law 25), Baden-Baden: Nomos.
Klump, Rainer/ Vec, Miloš (eds.) (2012):International Law and the World Economy in the 19th Century (Studies in the History of International Law 26), Baden-Baden: Nomos, VII, 271 pp.
Lovric-Pernak, Kristina (2013): Morale internationale and humanité in international law of the late 19th century. Meaning and function in state practice and science (Studies in the History of International Law 30), Baden-Baden: Nomos, 200 pp.

The most important events in the research project include
“Storia teoria e diritto internazionale. La costruzione di una disciplina”, International Conference, Lecce (Italy) May 20-22, 2009, “Völkerrecht und Weltwirtschaft im 19. Jahrhundert. Die Internationalisierung der Ökonomie aus völkerrechts- und wirtschafts(theorie-)geschichtlicher Perspektive”, Workshop, 3-4 September 2009 in Frankfurt am Main, Max Planck Institute for European Legal History and “The Emergence and Transformation of Foreign Policy.” International Conference, Johns Hopkins University, Bologna, June 10-12, 2011.

Further information at: https://www.rg.mpg.de/forschung/voelkerrechtsgeschichte

News from the research center

Event
02.06.2026 | Brussels

Zusammenhalt, Vertrauen und Demokratie in Europa

Panel Discussion, Lecture

Vertrauen, Zusammenhalt, Demokratie – drei große Begriff, die in Europa derzeit allgegenwärtig sind. Doch wie belastbar sind sie eigentlich und was beschreiben sie? Was genau meinen wir eigentlich, wenn wir von politischem Vertrauen und gesellschaftlichem Zusammenhalt sprechen? Und braucht es – wie häufig behauptet – ein gewisses Maß an sozialer oder kultureller Homogenität, damit Vertrauen wachsen und Zusammenhalt entstehen kann? Diesen Fragen widmen wir uns in der aktuellen Ausgabe der Crisis Talks – auf dem Podium und im Gespräch mit unseren Gästen.

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Event
22.06.2026 | Frankfurt am Main

Rechtsextremismus und Polizei - Erscheinungsformen, Umgangsweisen, Perspektiven

Panel Discussion

Die Diskussion knüpft an den Sammelband „Rechtsextremismus als Herausforderung für Polizei und Gesellschaft“ an, der aktuelle Perspektiven aus Wissenschaft, Praxis und Zivilgesellschaft zusammenführt.

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News
18.05.2026

Videopodcast-Reihe „Our Planet, Our Health“ gestartet

Mit „Our Planet, Our Health“ startet eine neue Videopodcast-Reihe zu Fragen globaler Gesundheitsgerechtigkeit. Die Reihe, gehostet von Dr. Romina Rekers, ist eine Initiative des Global Health Justice Postdoctoral Programme (GHJ), gefördert von der Höppschen Stiftung.

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Publication
12.05.2026 | Online article

Disinhibited Informalization: Talk Radio, Bro Podcasts and the Aesthetics of Populism

This essay by Johannes Völz is a revised and updated translation of “Enthemmte Informalisierung: Talk Radio, Bro-Podcasts und die Ästhetik des Populismus,” WestEnd: Neue Zeitschrift für Sozialforschung 22.2 (2025): 3–24. It is published here as part of the b2o Review’s “Stop the Right” dossier.

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Event
27.05.2026 | Frankfurt

Von der Selbstermächtigung zum sozialen Widerstand

Lecture

Vortrag von Prof. Dr. Axel Honneth (Frankfurt am Main / New York Columbia University) mit anschließender Diskussion im Rahmen des Rechtstheoretischen Mittwochsseminars von Klaus Günther, Dan Wielsch und Benno Zabel.

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Event
25./26.06.2026 | Frankfurt

Shifting Regimes, Changing Orders

Conference

Conference as part of WDC2026 in collaboration with Deutsche Gesellschaft für Designtheorie und -forschung (DGTF), Kunstgewerbemuseum/Design Campus SKD and Design and Democracy

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Event
28./29.05.2026 | Frankfurt am Main

Global Health Justice: Principles and Practice

Conference

Following the research focus of the Global Health Justice Postdoctoral Programme, funded by Höppsche Stiftung, the "Global Health Justice: Principles and Practice" conference places a particular emphasis on themes such as the human right to health, political activism and health justice issues, and problems of structural injustice and vulnerable populations in health care. Keynote lectures by Jonathan Wolff and Kanchana Mahadevan. The Global Health Justice Programme and this conference are supported by the Höppsche Stiftung in Villmar.

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Event
14.07.2026 | Frankfurt am Main

Democracy Over Time and the Climate Crisis

Lecture Series

Vortrag von Anja Karnein (Binghamton). Die Vortragsreihe untersucht Fragen der Klimakrise als Herausforderungen für demokratische Gesellschaften und konzentriert sich auf Themen wie politische Legitimität, Widerstand gegen fossile Brennstoffe und die Interessen künftiger Generationen. Sie wird organisiert von Prof. Dr. Darrel Moellendorf und Dr. Lukas Sparenborg.

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