Acknowledgements
We would like to thank the following archivists, scholars, associations and collectors who helped us navigate the archives and introduced us to relevant sources:
The association Amics dels goigs, the Association Symphorose (Paris), Catherine Barbé (Archives diocésaines de Rouen), Véronique Bontemps (Archives historiques du diocèse de Nantes), Joachim Bouflet, Angela Franca Maria Canu (Sassari, Archivio di Stato di Sassari/State Archives of Sassari), William A. Christian Jr., Alejandro Cifres (Rome, ACDF), Bart Clymans (Ruusbroec Institute), Patricia De Bruyn (Ruusbroec Institute), Christian Dury (Archives de l’Évêché de Liège), Thomas Fandel (Archiv Bistum Speyer), Wolfgang Fronhöfer (Achiv des Bistums Passau), Roland Götz (Archiv des Erzbistums München und Freising), Claire Gurvil (Archives historiques du diocèse de Nantes), Els Herrebout (Staatsarchiv Eupen), Paul Janssen (Documentatiecentrum Borsbeek), Gàbor Klaniczay, Pierre Lassave, Monique Maillard-Luypaert (Archives de Séminaire de Tournai), Heinz Mestrup (Bistumsarchiv Münster), César Murillo (Arxiu diocesà de Mallorca), Stefan Nicolay (Bistumsarchiv Trier), Jean Nulens, Arnold Otto (Erzbistumsarchiv Paderborn), Daniel Ponziani (Rome, ACDF), Jean-Michel Potin (Archives de la Province dominicaine de France), Angela Pund (Gedenkstätte Anna Katharina Emmerick), Patricia Quaghebeur (Kadoc), Jochen Rösel (Staatsarchiv Amberg), Lucia Signori (Brescia, Archivio Storico Diocesano di Brescia/Diocesan Archive of Brescia), the sisters of the Hermanas de Jesús Paciente (Barcelona), Brigitte Tandonnet (Archives diocésaines de Bordeaux), Gerrit Vanden Bosch (Archief Aartsbisdom Mechelen), Joseph van Elten (Archiv Erzbistum Köln), Erna Van Looveren (Ruusbroec Institute), Anne Verdure-Mary (the Fonds Louis Massignon at the Bibliothèque Nationale de France), Ludmila Vesely Leonardi, Giancarlo Zichi (Sassari, Archivio Storico Diocesano di Sassari/Diocesan Archive of Sassari).
This project has received funding from the European Research Council (ERC) under the European Union’s Horizon 2020 research and innovation programme, under grant agreement number 637908.