For french people who want a taste of how deep this rabbit hole goes, a french scholar named Sylvie Barnay has also apparently devoted a good part of her life to Jean de Morigny (John of Morigny), the Monk. Here is a link to a small-ish document in "french", the quotes meaning that it's from the "Proceedings of the Congresses of the Society of Medievalist Historians of Public Higher Education", who seem to speak a higher order french than me : https://www.persee.fr/doc/shmes_1261-9078_1995_act_25_1_1657