Religious heritage has long been within the scope of academia, but very little research has been conducted on the heritagization of Catholic monasteries. This is remarkable considering the longstanding historical presence and social impact of these institutes that, in recent times, have also become well-visited spiritual centers and much-cherished heritage objects. This book addresses this lacuna. It does so through examining the heritagization process of De Heilige Driehoek (The Holy Triangle), a religious site comprised of three living monasteries in the south of the Netherlands. Ever since the turn of the millennium, the monastic communities living there have increasingly experienced the involvement of heritage groups. In this dynamic, the distinctive religious tradition of the monastics has led to a distinctive heritage perception of the area; one in which the spiritual and historical values of this tradition are recognized. However, as these values are translated into a secular heritage discourse, the question arises how this translation relates to the self-understanding and needs of the monastics. The aim of this book is to conceptualize through a historical lens the evolving and differing ways in which the different parties involved envision the meaning, potential, and nature of the monasteries. This study shows the struggle of heritage groups with creating a compelling narrative for their intended audiences and the often problematic impact this has on religious communities. In doing so, it offers a new perspective on the complicated relationship between religion and heritage