The problem scrutinized in this thesis is the relationship between Robert Grosseteste, mentioned in the colophon of William of Shoreham's "Song to Mary," and the author of said poem. The influence of Grosseteste on William of Shoreham appears to be extensive. Many similarities of organization, diction, and, especially, imagery, exist in the works of both men. The images of the windowpane, the mirror, and Mary as a castle are found in more than one instance in both Grosseteste's Chasteau d'Amour and in several of Shoreham's poems. Moreover, the borrowed imagery in Shoreham's poetry is unquestionably superior to any other in his works. It is the conclusion of this thesis that Robert Grosseteste was a considerable influence on the works of William of Shoreham.