Marie-Hélène Blanchet, PhD, is a research director at the Centre National de la Recherche Scientifique (UMR 8167 Orient et Méditerranée) in Paris. Her research focuses on the intellectual and religious history of the Byzantine Empire during the Palaiologan period (13th–15th centuries). Among other works, she is the author of Georges Gennadios Scholarios (vers 1400–vers 1472): un intellectuel orthodoxe face à la disparition de l’Empire byzantin (2008) and Théodore Agallianos, Dialogue avec un moine contre les Latins (1442) (2013). Within the ‘Thomas de Aquino Byzantinus’ project, she now prepares the critical edition of the two Greek translations of Thomas Aquinas’ De rationibus fidei.Raúl Estangüi Gómez, PhD, studied and taught at the University Paris 1 Panthéon-Sorbonne. He is currently a research scientist at the Spanish National Research Council in Madrid. His main fields of research are the history of the Byzantine Empire during the Palaiologan period (1261–1453) and the medieval archive documentation in Greek. He is the author of numerous publications, including the book Byzance face aux Ottomans. Exercice du pouvoir et contrôle du territoire sous les derniers Paléologues (milieu du xiv e – milieu du xv e siècle) (2014). He is a member of the team responsible for publishing the Acts of Mount Athos and he is the coeditor of Actes de Vatopédi, vol. III, De 1377 à 1500 (2019).