Leonine verse is a type of versification

Versification

Versification may be*the art of making verses, see poetry*the theory of the phonetic structure of verse, see meter *the rendition of a prose work into verse, especially of classical works during the Middle Ages, see medieval poetry...

 based on internal rhyme

Internal rhyme

In poetry, internal rhyme, or middle rhyme, is rhyme that occurs in a single line of verse.Internal rhyme occurs in the middle of a line, as exemplified by Coleridge, "In mist or cloud, on mast or shroud" or "Whiles all the night through fog-smoke white," in "The Rime of the Ancient Mariner." ...

, and commonly used in Latin verse of the European Middle Ages. The invention of such conscious rhymes, foreign to 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

Bibliothèque nationale de France

The is the National Library of France, located in Paris. It is intended to be the repository of all that is published in France. The current president of the library is Bruno Racine.-History:...

 of Paris

Paris

Paris is the capital and largest city in France, situated on the river Seine, in northern France, at the heart of the Île-de-France region...

. This "history" is composed in Latin verses, all of which rhyme in the center. It is possible that this Leonius is the same person as Leoninus

Léonin

Léonin is the first known significant composer of polyphonic organum. He was probably French, probably lived and worked in Paris at the Notre Dame Cathedral and was the earliest member of the Notre Dame school of polyphony and the ars antiqua style who is known by name...

, a Benedictine

Benedictine

Benedictine refers to the spirituality and consecrated life in accordance with the Rule of St Benedict, written by Benedict of Nursia in the sixth century for the cenobitic communities he founded in central Italy. The most notable of these is Monte Cassino, the first monastery founded by Benedict...

 musician of the twelfth century, in which case he would not have been the original inventor of the form.

Another very famous poem in Leonine rhyme is the De Contemptu Mundi of Bernard of Cluny

Bernard of Cluny

Bernard of Cluny was a Benedictine monk of the first half of the 12th century, a poet, satirist, and hymn-writer, author of the famous verses De contemtu mundi, "On Contempt for the World"....

, whose first book begins:

Hora novissima, tempora pessima sunt — vigilemus.
Ecce minaciter imminet arbiter ille supremus.
Imminet imminet ut mala terminet, æqua coronet,
Recta remuneret, anxia liberet, æthera donet.

(These are the last days, the worst of times: let us keep watch. Behold the menacing arrival of the supreme Judge. He is coming, he is coming to end evil, crown the just, reward the right, set the worried free, and give the skies.)

As this example of tripartiti dactylici caudati (dactylic hexameter

Dactylic hexameter

Dactylic hexameter is a form of meter in poetry or a rhythmic scheme. It is traditionally associated with the quantitative meter of classical epic poetry in both Greek and Latin, and was consequently considered to be the Grand Style of classical poetry...

 rhyming couplet

Couplet

A couplet is a pair of lines of meter in poetry. It usually consists of two lines that rhyme and have the same meter.While traditionally couplets rhyme, not all do. A poem may use white space to mark out couplets if they do not rhyme. Couplets with a meter of iambic pentameter are called heroic...

s divided into three) shows, the internal rhymes of leonine verse may be based on tripartition of the line (as opposed to a caesura

Caesura

thumb|100px|An example of a caesura in modern western music notation.In meter, a caesura is a complete pause in a line of poetry or in a musical composition. The plural form of caesura is caesuras or caesurae...

in the center of the verse) and do not necessarily involve the end of the line at all.