The historiography of medieval cities in the Low Countries has long been influenced by the legacy of Henri Pirenne (1862–1935) and his pupils. The Belgian historian and his followers used new (positivist) methods to study history, such as critical source analysis and teaching in seminars, which had a great impact on contemporary scholars in Belgium and elsewhere. Furthermore, Pirenne's selection of original research topics drastically changed the study of medieval history on the Continent. Influenced by research trends in France and Germany, Pirenne did ground-breaking new research, for instance, in the field of urban history. His publications on the origins of towns, on the ‘early democracies’ in the Low Countries, and on the socio-economic background of urban growth and decline inspired many colleagues and his students. His research on particular topics in the field of urban history has, until the present day, been a fruitful starting point for many Ph.D. students. Three of these topics constitute the subject of this review article: first, the origins of towns; secondly, the social history of urban politics and thirdly, the economy and finances of cities. This review of recent Ph.D. theses on the urban history of the Low Countries will demonstrate the importance of Pirenne's legacy, paying close attention to the valuable refinements that have been made to his findings in the last decade. Moreover, the actual research trends and the fresh perspectives of young scholars on the Low Countries’ history can be of great use for scholars of the history of cities in other regions in late medieval Europe.