While Bishop Lucas of Tuy has been best remembered over the centuries as the author of the Chronicon Mundi ("Chronicle of the World") that contributed to Spanish historiography, the apocalyptic work that is dubbed the "Vision of John the Hermit'"(from Asturias) sheds light on some aspects of Lucas' ecclesiastical career in León prior to his being elected bishop of Tuy in 1239. This work takes the form of a letter that was likely written in 1234 and is addressed to the Catholic cardinal Jacques de Vitry, who notably served as bishop of Acre in the Holy Land and wrote the Historia Orientalis ("Eastern History") that is an important Latin source for historiography of the Crusades.
This work was first brought to public attention in 1941 by Livarius Oliger. The identification of Lucas as its author was only made in 2006 by Robert Lerner and Christine Morerod, who provided a new critical edition of the Latin text. I base my translation upon their edition of the text.
Having read the text for myself, I agree with the identification of Lucas by Lerner and Morerod for the reasons they outline. For one thing, the discussion of the rise of a heresy in León and the author's determination to counter it correspond with details in the work De Altera Vita ("Concerning the next life") that is attributed to Lucas and similarly focuses on countering the heretics in León (see in particular De Altera Vita 3.9).
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