Caption: "Miniature of Richard of Wallingford (1292--1336), Abbot (1326--1336) of St. Albans, mathematician and inventor of a mechanical astronomical clock. He is shown seated at his desk measuring with a compass."

From Gesta Abbatum Monasterii Sancti Albani (History of the abbots of St Albans) (late 14th century) by Thomas of Walsingham (died c. 1422).

Credit/Permission: Thomas of Walsingham (died c. 1422)?, late 14th century (uploaded to Wikipedia by User:Leinad-Z, 2006) / Public domain.
Image link: Wikipedia: File:Richard of Wallingford.jpg.
Local file: local link: richard_of_wallingford.html.
File: Art_r file: richard_of_wallingford.html.