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Leonine verse is a type of versification based on an internal rhyme between a word within the line before a caesura and a word at the end, and commonly used in Latin verse of the European Middle Ages. The proliferation of such conscious rhymes, uncommon in Classical Latin poetry, is traditionally attributed to a probably apocryphal monk Leonius, who is supposed to be the author of a history of the Old Testament (Historia Sacra) preserved in the Bibliothèque Nationale of Paris. It is possible that this Leonius is the same person as Leoninus, a Benedictine musician of the twelfth century, in which case he would not have been the original proliferator of the form.