Robert Grosseteste (c. 1168-1253), Bishop of Lincoln from 1235 to 1253, was one of the most prominent and remarkable figures in thirteenth-century English intellectual life. He made a powerful impression on his contemporaries and subsequent thinkers at Oxford, and has been hailed as an inspiration to scientific developments in fourteenth-century Oxford.

De libero arbitrio, his influential treatise on free will, was written between about 1225 and the early 1230s. This new edition contains Latin texts and en-face English translations of the two versions of the treatise. An...