What is "agobard"

Agobard of Lyon (ca. 779-840) was a Spanish-born priest and archbishop of Lyon, during the Carolingian Renaissance. The author of multiple treatises, ranging in subject matter from the iconoclast controversy to Spanish Adoptionism to critiques of the Carolingian royal family, Agobard is best known for his critiques of Jewish religious practices and political power in the Frankish realm. He was succeeded by Amulo of Lyons.