# Leonius

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**Leonius** may refer to:

- [Léonin](/source/L%C3%A9onin) ([fl.](/source/Floruit) 1150s — d. ? 1201), the first known significant composer of polyphonic organum;
- the author of a versified *Historia Sacra*, found in a manuscript of the Bibliothèque Nationale in Paris (see [Leonine verse](/source/Leonine_verse))
- the probably apocryphal inventor of [Leonine verse](/source/Leonine_verse), if different from either or both of the preceding two persons
- [Leonius (Dean of Wells)](/source/Leonius_(Dean_of_Wells)), fl. 1213

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