Notker the Stammerer (c. 840 – 6 April 912), Notker Balbulus, or simply Notker, was a Benedictine monk at the Abbey of Saint Gall active as a poet, scholar and (probably) composer. Described as "a significant figure in the Western Church", Notker made substantial contributions to both the music and literature of his time. He is usually credited with two major works of the Carolingian period: the Liber Hymnorum, which includes an important collection of early sequences, and the earliest biography of Charlemagne, Gesta Caroli Magni. His other works include a biography of Saint Gall, the Vita Sancti Galli, and a martyrology.