found:Ensemble organum. Leonin [SR] p1985.
found:New Grove(Léonin (Magister Leoninus; ?Leo) fl. Paris c1163-90; composer of organum; no works survive ascribed to him)
found:Grove music online, Aug. 30, 2004(Leoninus (Magister Leoninus; Magister Leonius; Leo; Léonin); fl. 1150s-c1201, Paris; composer of polyphony, including organum and, probably, conductus; no works ascribed to him in musical sources or by contemporaneous theorists)
found:Interpretation of Scripture: practice, 2015:title page (Leonius of Paris) page 475 (musicologist Craig Wright has identified the musician Magister Leoninus, a composer of organum at Notre Dame, with Leonius the poet, who was a canon and priest of the collegiate church of St. Benôit and was also associated with the Abbey of St. Victor; Leonius was the author of the Historia Veteris Testamenti)
found:Journal of Medieval Latin, v. 10 (2000):page 239 (Master Leoninus (ca. 1135-1201); Leoninus, a canon, poet and musician at the cathedral of Notre Dame in Paris during the second half of the twelfth century)
found:The Oxford companion to music, viewed online on December 3, 2015(Léonin; Leoninus; canon, poet, and composer; active at St Benôit and later Notre Dame, Paris; chief poetic work is Hystorie sacre gestas ab origine mundi; his compositional activity is mentioned by the English theorist known as Anonymous IV, writing around 1270, who states that he was "optimus organista" (i.e. best composer of organum))