poet, teacher, and archbishop. He entered the abbey of Fulda as an oblate, became master of the school (818) and abbot (824–42). In 847 he became Abp. of Mainz.
As a schoolmaster he wrote books on grammar and the reckoning of time, commentaries on nearly every Book of the Bible, and many hymns. As abbot he wrote treatises on ecclesiastical law and practice, including the De institutione clericorum, a manual for clergy; as archbishop he addressed specific issues of discipline (e.g. chorepiscopi) and theology (notably in his De praedestinatione, against Gottschalk). The De rerum naturis, written c.842, is an encyclopedic work. Over 50 of his letters and c.100 poems survive. The ‘Veni Creator’ has sometimes been attributed to him.