After studying philosophy for five years at Toulouse, he entered the Franciscan monastery at Aurillac, where he continued his studies for five years longer. His experiments in distillation led to the discovery of what he termed aqua vitæ, or usually quinta essentia, and commended as a panacea for all disease. His work as an alchemist forms the subject-matter of De consideratione quintæ essentiæ and De extractione quintæ essentiæ; likewise Libellus de conficiendo vero lapide philosophico ad sublevandam inopiam papæ et cleri in tempore tribulationis. His prophecies and violent denunciation of ecclesiastical abuses brought him into disfavour with his superiors, resulting in his imprisonment in the local Franciscan convents. During a transfer from one convent to another, he was able to reach Avignon and present an appeal before Pope Clement VI in 1349. While there he wrote in 1349 his Visiones seu revelationes, and in 1356 Vade Mecum in tribulatione and Liber Ostensor. His other works include commentaries on the Oraculum Cyrilli, the recently discovered Sexdequiloquium and many other lost treatises and commentaries on various prophecies. He died between 1366 and 1370, probably at Avignon.
Works
Liber Lucis
Liber de Consideratione Quintae Essentiae
Commentarius super Cyrillum
Liber Secretorum Eventuum /Liber Conspectorum Archanorum ; modern edition: Christine Morerod-Fattebert, Robert E. Lerner, Le Liber secretorum eventuum de Jean de Roquetaillade, Fribourg: Editions universitaires, 1994.
De Oneribus Orbis : a comment on the prophecy Veh Mundo in Centum Annis, related to Arnaldus de Villa Nova.
Liber Ostensor, modern edition: Jean de Roquetaillade, Liber ostensor quod adesse festinant tempora. Édition critique sous la direction d'André Vauchez, par Clemence Thévenaz Modestin et Christine Morerod-Fattebert, Rome: Ecole française de Rome, 2005.
Vademecum in tribulatione :
editio princeps in: Edward Brown, Fasciculus rerum expetendarum ac fugiendarum II, London, 1690, modern editions : a) Giovanni di Rupescissa. Vade mecum in tribulatione, critical edition by Elena Tealdi, historical introduction by Robert E. Lerner and Gian Luca Potestà, Milan: Vita e Pensiero. Dies Nova, 2015, b) John of Rupescissa's Vade mecum in tribulacione. A Late Medieval Eschatological Manual for the Forthcoming Thirteen Years of Horror and Hardship. Edited by Matthias Kaup, London/New York: Routledge. Church, Faith and Culture in the Medieval West, 2016.
Litterae
Epistola Praedicens Quosdam Eventus et Tribulationes
Sexdequiloquium
Studies
Jeanne Bignami-Odier, Etudes sur Jean de Roquetaillade , Paris, Vrin, 1952
Robert Halleux, « Les ouvrages alchimiques de Jean de Rupescissa », Histoire littéraire de la France, 41, Paris, Imprimerie nationale, 1981, p. 241-284.
Sylvain Piron, « L’ecclésiologie franciscaine de Jean de Roquetaillade », Franciscan Studies, 65, 2007, p. 281-294.
Sylvain Piron, Le Sexdequiloquium de Jean de Roquetaillade, Oliviana, 3, 2009 : http://oliviana.revues.org/index327.html.
Robert E. Lerner, “John the Astonishing”, Oliviana, 3, 2009 : http://oliviana.revues.org/index335.html.
DeVun, L. Prophecy, Alchemy, and the End of Time: John of Rupescissa in the Late Middle Ages.
Udo Benzenhöfer Johannes‘ de Rupescissa. Liber de consideratione quintae essentiae omnium rerum deutsch. Studien zur Alchemia medica des 15. bis 17. Jahrhunderts mit kritischer Edition des Textes. Steiner, Stuttgart 1989.
