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composed as a dialogue, preserved in the Angelica Library at Rome (MS. 1413, ff. 1–24 "Since various writers of history, however differently . . ."), where the author, arguing from the astronomical cycles, finds a discrepancy of twenty-one years in the Dionysian era The "Anno Domini" system of dating established by Dionysius Exiguus in the 6th century., so that the current year of 1092 is corrected to 1112 (Haskins, Studies, p. 84). The introduction to the Chronicle of Marianus was abridged and amended by Robert de Losinga or Lotharingus, Bishop of Hereford from 1079 to 1085 A.D. Losinga was a noted mathematician and astronomer who brought continental scholarship to England., to whom the credit of this criticism of the Dionysian Calendar is sometimes given. Manuscripts of this abridgement are Bodleian Auct. F. 3. 14 and Auct. F. 5. 19 (see Hardy, Descriptive Catalogue, ii. 46, 75.) Usher, for example, mentions him in his Preface to the Annals of the Old Testament.
Marianus seems to have had some influence in the west of England. His system was adopted by Florence of Worcester, and was copied thence by Roger de Hoveden and Simeon of Durham. William of Malmesbury makes two references to him which are worth mention:
"During the reign of this emperor, Marianus Scotus flourished, who was first a monk at Fulda and later an anchorite original: "inclusus." A monk who lived walled into a cell as a form of extreme religious devotion. at Mainz; through his contempt for the present life, he earned the grace of the life to come. During a long life of leisure, he scrutinized the chroniclers and discovered a discrepancy between the cycles of Dionysius Exiguus and the truth of the Gospels; therefore, recalculating every single year from the beginning of the world, he added the twenty-two years that were missing from the aforementioned cycles, but he had few or no followers of his opinion. For this reason, I often wonder why this misfortune stains the learned men of our time: that in such a great number of students, in such sorrowful paleness of those working by lamplight original: "lucubrantium." Refers to the physical toll of late-night study., hardly anyone brings back the full praise of knowledge. Established custom is so pleasing; almost no one grants the clarity of agreement to new discoveries, even when they are probably true, as they deserve; with all their efforts they crawl back to the opinions of the ancients, and everything recent is considered filthy; thus, because only favor nourishes genius, everything has grown numb since favor has ceased." (Deeds of the Kings of the English, Rolls Series, ii. 345.)
"At that time, Marianus was a monk living as an anchorite at Mainz. Having scrutinized the chroniclers during a long period of solitary leisure, he—either first or alone—noticed the discrepancy between the cycles of Dionysius Exiguus against the truth of the Gospels. Therefore, recalculating every year from the beginning of the world, he added the 22nd years which were missing from the cycles, and set about composing a great and most extensive Chronicle. Robert [de Losinga] marveled at this book uniquely, and rivaling it wonderfully, he saw to it that it was brought to England. Finally, captivated by Marianus’s genius, he summarized whatever the author had said too lengthily, condensing it so brilliantly that the summary seems to be worth more than the diffusion of that massive volume." (Lives of the Bishops, Rolls Series, p. 301.)