UBALDO di SANT'AMANDO. - Learned monk (Hucbaldus, Hubaldus, Hugbaldus, Hucboldus, Uchubaldus), born c. 830, entered the Benedictine abbey of S. Amando (the celebrated «Monasterium Elnomense» in Gallic Flanders), where he died on 20 June 930.
He was educated by his learned uncle Milone in the same abbey and perfected his knowledge of science and letters at Nevers (?) and at Auxerre in France. His exceptional literary, theological, and especially musical learning, accompanied by outstanding religious virtues, led to his appointment (c. 872) as head of the school of S. Amando; then (883) he directed the school of the abbey of S. Bertino near St-Omer, and finally (893) that of Reims, whither he went at the request of Archbishop Fulco. Around the year 900 he returned to the abbey of S. Amando. He was bound in friendship to the great scholars and men of letters of his time.
Besides several verse compositions and the Acta martyrii ss. Ciriaci et Julittae (apocryphal), he left various hagiographical works of great value, such as the lives of S. Rictudis, S. Aldegundis, and other biographies of Flemish saints of the seventh century. His writings on music are important for the history of this art in that century; however, the authenticity of several of them is disputed. The De harmonica institutione appears to remain his work (M. Gerbert, Scriptores de musica sacra, I, S. Blaise 1784, pp. 104-105), in which, while drawing upon earlier works, he provides valuable information on the notation of intervals, etc.