Research output per year
Research output per year
Personal profile
Research interests
Professor Lesaffer's research focuses on the historical and recent development of the international legal order.
Career
1991-1998 assistant at the Department of Roman Law and Legal History at the Law School of the Catholic University of Leuven
1991-1995 attorney at law at the Bruges bar
1998-2019 parttime lecturer, reader (2001), professor (2004) and senior professor (2008) at the Law School of the University of Leuven
1998-1999 postdoctoral research fellow of the Foundation for Scientific Research of the Flemish Government
1999-present professor of legal history at Tilburg University
2008-2012 dean of the Tilburg Law School
2019-present professor of legal history at KU Leuven
Teaching
Legal history, in particular constitutional history and history of international law, as well as history of international relations
Current courses
Click here for my courses.
Expertise related to UN Sustainable Development Goals
In 2015, UN member states agreed to 17 global Sustainable Development Goals (SDGs) to end poverty, protect the planet and ensure prosperity for all. This person’s work contributes towards the following SDG(s):
External positions
Senior professor (KU Leuven)
1 Oct 2019 → …
Keywords
- History Of Law
- Constitutional History
- History of International Relations
- History Of International Law
Fingerprint
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Collaborations and top research areas from the last five years
Recent external collaboration on country/territory level. Dive into details by clicking on the dots or
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Introduction
Lesaffer, R., Druwé, W. & Sluijs, G., 2026, Natural Law and Domestic Government in the Early Modern Period. Druwé, W., Lesaffer, R. & Sluijs, G. (eds.). Leiden and Boston: Brill Nijhoff, p. 1-10 10 p. (Legal History Library; vol. 80).Research output: Chapter in Book/Report/Conference proceeding › Chapter › Scientific › peer-review
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Natural Law and Domestic Government in the Early Modern Period
Lesaffer, R. (Editor), Druwé, W. (Editor) & Sluijs, G. (Editor), 2026, Leiden and Boston: Brill Nijhoff. 292 p. (Legal History Library; vol. 80)Research output: Book/Report › Book editing › Scientific › peer-review
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Peacemaking in old regime Europe
Lesaffer, R., 2025, The Cambridge history of international law: International law in early modern Europe. Lesaffer, R. (ed.). Cambridge: Cambridge University Press, Vol. 6. p. 588-619 32 p. (The Cambridge history of international law; vol. 6).Research output: Chapter in Book/Report/Conference proceeding › Chapter › Scientific › peer-review
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Peacemaking in renaissance Europe
Lesaffer, R., 2025, The Cambridge history of international law: International law in early modern Europe. Lesaffer, R. (ed.). Cambridge, Vol. 6. p. 232-262 31 p. (The Cambridge History of International Law; vol. 6).Research output: Chapter in Book/Report/Conference proceeding › Chapter › Scientific › peer-review
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Preface
Lesaffer, R., 2025, The Cambridge history of international law: International law in early modern Europe. Lesaffer, R. (ed.). Cambridge: Cambridge University Press, Vol. 6. p. xvii-xxiii 7 p. (The Cambridge history of international law; vol. 6).Research output: Chapter in Book/Report/Conference proceeding › Chapter › Scientific › peer-review
Activities
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International law in search for a new global peace order: what about non-state actors?
Muslu, Z. (Speaker) & Lesaffer, R. (Speaker)
4 Dec 2025Activity: Talk or presentation types › Oral presentation › Scientific
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Law Schools Global League Academic Conference on ‘Sustainable Globalization’
Verbruggen, P. (Organiser), Reins, L. (Organiser), van den Bosch, S. (Organiser) & Lesaffer, R. (Organiser)
8 Feb 2021Activity: Participating in or organising an event types › Organising a conference › Scientific
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Cambridge University Press (Publisher)
Lesaffer, R. C. H. (Editor)
2016 → 2026Activity: Publication peer-review and editorial work types › Editorial activity › Scientific
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Oxford University Press (Publisher)
Lesaffer, R. C. H. (Editor)
1 Sept 2014Activity: Publication peer-review and editorial work types › Editorial activity › Scientific
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European Society of International Law (External organisation)
Lesaffer, R. C. H. (Chair)
Sept 2014 → Sept 2015Activity: Membership types › Membership of network › Scientific
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Overig historisch onderzoek
van den Berg, R. (Researcher), Lesaffer, R. (Researcher), van van Erp-Jacobs, T. (Researcher), Broers, E.-J. (Researcher) & Couperus, O. E. (Researcher)
1/04/00 → …
Project: Research project
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Romeins recht
Lesaffer, R. (Researcher), van van Erp-Jacobs, T. (Researcher), Broers, E.-J. (Researcher), Couperus, O. E. (Researcher) & van den Berg, R. (Researcher)
1/04/00 → …
Project: Research project
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Historical foundations of the international legal order in Europe (16th-20th century): state sovereignty and the process of international law-making and law-enforcement
Lesaffer, R. (Principal Investigator), van Blom, K. (Researcher) & Osiander, A. D. (Researcher)
1/01/00 → …
Project: Research project
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Global Law & Governance
Adams, M. (Researcher), Arnoldussen, T. (Researcher), Augenstein, D. (Researcher), Bastmeijer, K. (Researcher), Bijlmakers, S. (Researcher), Boot, E. (Researcher), Bot, M. (Researcher), De ruysscher, D. (Researcher), Fleurke, F. (Researcher), Goodwin, M. (Researcher), Goossens, J. (Researcher), Groenleer, M. (Researcher), Grover, L. (Researcher), Hendriks, F. (Researcher), Jägers, N. (Researcher), Karsten, N. (Researcher), Leenknegt, G.-J. (Researcher), Lesaffer, R. (Researcher), Lindahl, H. (Researcher), Maleki, A. (Researcher), Paiement, P. (Researcher), Partiti, E. (Researcher), Rajkovic, N. (Researcher), Raucea, C. (Researcher), Rombouts, B. (Researcher), Somsen, H. (Researcher), Trouwborst, A. (Researcher), Tzankova, I. (Researcher), Verschuuren, J. (Researcher), Wilthagen, T. (Researcher), Wolf, E. (Researcher), Wolswinkel, J. (Researcher), Zouridis, S. (Researcher), van Hulst, M. (Principal Investigator), van Waas, L. (Researcher), van der Schyff, G. (Researcher), Hirsch Ballin, E. (Researcher), Meuwese, A. (Researcher), Van Hulle, I. (Researcher), Stapper, M. (Researcher), Clements, R. (Researcher), Kari, V. (Researcher), Sipiorski, E. (Researcher), Mooij, A. (Researcher), den Hollander, M. (Researcher), Oosterom-Staples, H. (Researcher), van Bockel, B. (Researcher), Cavalcanti, M. (Researcher), Delgado, L. (Researcher), Geuens, M. (Researcher), Koenraad, R. (Researcher), Leach, M. (Researcher), Leijten, I. (Researcher), Leloup, M. (Researcher), Lukkari, H. (Researcher), Muslu, Z. (Researcher), Palombo, D. (Researcher), Bazzan, G. (Researcher), Frins, R. (Researcher), Gkliati, M. (Researcher), Kempeneer, S. (Researcher), Ranchordás, S. (Researcher), Timmermans, N. (Researcher), Huisman, P. (Researcher), Kaufmann, R. (Researcher), van Ostaaijen, J. (Researcher) & in 't Veld, M. (Researcher)
1/01/19 → 31/12/23
Project: Research project
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Georg Friedrich von Martens (1756-1821) en het moderne volkenrecht
van Blom, K. (Researcher), Lesaffer, R. (Tutor) & van van Erp-Jacobs, T. (Tutor)
1/02/01 → 1/01/16
Project: Research project
Prizes
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Member of the Academia Europaea (MAE)
Lesaffer, R. (Recipient), 2024
Prize: Other marks of recognition
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