c. 808-849

Swabian scholar whose Liber de cultura hortorum describes a number of herbs and medicinal plants and their healing properties. A Benedictine monk, he served as tutor to Holy Roman Emperor Charles II (the Bald) in about 829, and wrote a number of theological works. He also revised the famous biography of Charlemagne (742-814) by the latter's contemporary Einhard (c. 770-840).