The Department of Constitutional and Administrative Law of Leiden University has published a collection of research essays on the separation of powers. This collection addresses the main question of whether the historically developed combination of concepts of democratic legitimacy and the separation…

Towns and elites in Merovingian northern Gaul, 450-650

This volume publishes the proceedings of the eleventh annual University of Chicago Oriental Institute Seminar. It uses the sphere of legal institutions as a prism through which to consider gender relations in the ancient world, both in the Near East and beyond. It examines how similar issues were manifested…

For thousands of years, societies have fallen under the reign of a single leader, ruling as chief, king, or emperor. In this fascinating global history of medieval and early modern dynastic power, Jeroen Duindam charts the rise and fall of dynasties, the rituals of rulership, and the contested presence…

On 1 June 2022, Tom Herrenberg defended the thesis 'Prosecutorial Discretion in International Criminal Justice'. The doctoral research was supervised by Prof. P.B. Cliteur and Prof. B.R. Rijpkema.

What is better for waste recycling: a plastic, paper or ceramic cup? A bio-based or fossil-based coating? Waste sorting at the source or at a recycling facility? Ask ten experts and you will get ten different opinions. We can all agree on one thing: doing nothing is not an option. Thus, Leiden University…

On July 8 and 9, 2022, Leiden University hosted the second conference of the research group on Institutions for Conflict Resolution, in collaboration with Radboud University Nijmegen and Utrecht University.

Promotor: Prof.dr. F.S. de Boer, Co-promotor: D. Clarke

Professor emeritus Frank Pieke speaks on BBC and BBC Vietnamese about Xi Jinpings ongoing fight against corruption within the Communist Party.

The research presented in this thesis concerns one of the most important questions in software engineering of our time: how can we make sure that software is free from memory safety bugs?

What happens to the different waste streams?

Governing Cyberspace: Behavior, Power and Diplomacy is based on a selection of papers presented during The Hague Program for Cyber Norms' inaugural conference Novel Horizons: Responsible Behaviour in Cyberspace from 5-7 November 2018 in The Hague. The volume is edited by Dennis Broeders and Bibi van…

This thesis examines the impacts and challenges of water use of electric power system. This thesis found that there are large differences in water use of electricity technologies, with hydropower and thermal power being two large water users.

Parental divorce or separation is for many children an adverse experience in itself. Particularly the transitional period just before and after the separation between parents, during which parents and children have to adapt to the disruptions in family life is stressful. Previous studies showed that…

In this article, Friso Selten and Bram Klievink explore how public organisations strategically manage the adoption of AI.

This thesis probes under what conditions quantum computing presents an advantage over classical computing.

Hegemony and World Order explores a key question for our tumultuous times of multiple global crises.

Promotor: Prof.dr. T. Hankemeier, Co-promotores: Heiko van der Linden, Paul Vulto

On 18 January, Esteban Szmulewicz, a PhD candidate at the Department of Constitutional and Administrative Law, spoke on the following theme at an online seminar: 'Comments on the International IDEA report: the state of democracy in the world and the Americas in 2023. New checks and balances'.

The Dutch Student Orchestra is performing at Stadsgehoorzaal, Leiden’s concert hall, on 11 February. Several Leiden students have sacrificed many a free hour to the rehearsals. Days before the big performance we present them with three dilemmas.

Momenteel vindt onder Trump in de VS, een snelle ontmanteling van verschillende instituties, die de democratische rechtstaat stutten, plaats. Wim Voermans, hoogleraar staatsrecht, acht de kans aanzienlijk kleiner dat dit in Nederland zal gebeuren door ons meerpartijenstelsel, het poldermodel en het…

In a podcast episode of 'New Books in History' Claire Weeda talks about her book 'Ethnicity in Medieval Europe 950-1250: Medicine, Power and Religion'.

This doctoral thesis is an effort to understand how lipid phase-separation induced by diacylglycerol analogues in lipid-based nanoparticles affects their in vivo behavior, leading to specific nanoparticle-protein communications and selective cell targeting.

Like a mixture of oil and water, lipid membranes separate into two liquid phases.

An investigation into how racial stereotypes were created and used in the European Middle Ages.

Van Vark defended her dissertation 'Separation and immersion: the changing role of the armed forces in Northwestern liberal democracies’ on 17 October 2025. The doctoral research was supervised by Maartje van der Woude and Erwin Muller.

Are you thinking about studying History of Inequality and Power? Learn more and watch the introduction video.

This is a Special Issue of the peer-reviewed journal 'Social Sciences and Missions', which provides a forum for exploration of the social and political influence of Christian missions worldwide.

On 25 October 2018, Tu Zhang defended her thesis 'Public Reason Secularism: A Defense of Liberal Democracy'. The doctoral research was supervised by prof. P. Cliteur.

Proceedings of the Vth International Conference of Isis Studies, Boulogne-sur-Mer, October 13-15, 2011

The Case of the Painted Plaster

International law experts have voiced concerns about the recent attack on Iran. Legal philosopher Andreas Kinneging expressed a different perspective in an interview with ‘Trouw’ newspaper: 'In times of crisis, the best in people comes out.'

The primary goal of GAP is to study the impact of globalization and internationalization policies and practices on the gender balance in research and higher education in Norway.

The Dutch State is set to challenge The Hague Court of Appeal's ruling that the Netherlands must stop exporting arms to Israel at the Supreme Court. The government believes that foreign policy falls within the political domain and not within the judiciary. Geerten Boogaard, Professor of Constitutional…

Evidence-informed policy-making is crucial for good governance. Yet, despite the abundance of evidence from research and evaluation available to decision-makers, we know little about the actual influence of evidence on government policies. The ‘Power of Evidence’ (PoE) research programme, directed by…

A Leiden literary scholar, paintings of the Winter King and Queen and a string of pearls brought together by an exhibition in the Hague. Dr Nadine Akkerman: ‘The Winter Queen was a highly political person who used every means – including pearls - to showcase her royal lineage.’

Alternative perspectives and sources of colonial literature haven’t received much attention before now. School books have long ignored the violence that accompanies colonialsm. How can we paint an honest picture?

Are you curious about how societies are governed - and what makes a society just? At Leiden University, you’ll explore democracy, law, safety and public policy in both national and international contexts. From human rights to climate legislation, from elections to ethical dilemmas: you’ll learn to analyse…

Are you curious about how societies are governed - and what makes a society just? At Leiden University, you’ll explore democracy, law, safety and public policy in both national and international contexts. From human rights to climate legislation, from elections to ethical dilemmas: you’ll learn to analyse…

On Thursday 11 May 2017, Qiang Yu defended his doctoral thesis ‘Market Power and Competition Law in the Software Industry’. The supervisors of the research are Professor T.R. Ottervanger and Professor S.C.G. Van den Bogaert. A brief summary of his thesis is provided below.

In multi/many-core System-on-Chips (SoCs), the performance is almost linearly scaling with the number of processing elements.

On 18 June 2019, Peter Kempees defended his thesis 'Hard power and the European Convention on Human Rights'. The doctoral research was supervised by Prof. R.A. Lawson and Prof. H. Duffy.

This thesis investigates the contribution of quantum computers to machine learning, a field called Quantum Machine Learning. Quantum Machine Learning promises innovative perspectives and methods for solving complex problems in machine learning, leveraging the unique capabilities of quantum computers…

Are you curious about how societies are governed – and what makes a society just? At Leiden University, you’ll explore democracy, law, safety and public policy in both national and international contexts. From human rights to climate legislation, from elections to ethical dilemmas: you’ll learn to analyse…

Are you curious about how societies are governed – and what makes a society just? At Leiden University, you’ll explore democracy, law, safety and public policy in both national and international contexts. From human rights to climate legislation, from elections to ethical dilemmas: you’ll learn to analyse…

Radiography is an important technique to inspect objects, with applications in airports and hospitals. X-ray imaging is also essential in industry, for instance in food safety checks for the presence of foreign objects.