John of Damascus (c.675–c.750)

John of Damascus, who lived in the seventh and eighth centuries, is known for his Fount of Knowledge, which became the standard textbook of theology in the Eastern Orthodox tradition, and his opposition to the Iconoclasts, who opposed the use of images in Christian worship. The Fount of Knowledge, which drew heavily on patristic sources, was translated in the West by Robert Grossteste, where it had an influence on writers such as Peter Lombard.