Often considered as the first phenomenon of mass media in history, the use of the printing press by Protestants has been widely studied and has generated an abundant bibliography. In contrast, the production and use of books and printed images by the partisans of the Catholic Reformation have not received the attention they deserve, especially in the context of the Low Countries. Though there are studies on a few core figures - such as Christopher Plantin - or a few important publishing enterprises, many other less well-known cases are still as yet unstudied. However, these need to be addressed in order better to apprehend the extent, dynamism and underlying mechanisms of the processes set up to support Catholic Reform. This symposium aims to take an interdisciplinary approach in order to deal with the complexity of this phenomenon. Organised by the Research Unit Transitions of the University of Liège, in partnership with the FNRS group « Documents rares et précieux », the symposium will take place in the context of Liège’s celebrations of the 500th anniversary of the early Reformation. http://web.philo.ulg.ac.be/transitions/wp-content/uploads/sites/3/2016/12/reconquete_par_le_livre_programme.pdf