Owing to the carelessness of transcribers, the conjectural corrections of critics, the insertion of glosses and paraphrases, and especially to the preference for readings found in the earlier Latin versions, the text of Jerome was corrupted at an early date.
Around 550 CE, Cassiodorus made an attempt at restoring the purity of the Latin text.
Charlemagne entrusted the same labour to Alcuin, who presented his royal patron with a corrected copy in 801.
– 821], Lanfranc, Archbishop of Canterbury (1070–1089), Stephen Harding, Abbot of Cîteaux (1109–1134), and Nicolaus Maniacoria (about the beginning of the thirteenth century).
Little more is known of this work but the following correctories are more noted: The Franciscan writer Roger Bacon was the first to formulate the true principles which ought to guide the correction of the Latin Vulgate;[according to whom?]
Two of them are allied to the Dominican correctory of the convent of Saint-Jacques; one is represented by the Manuscript lat.