Thomas Graham. 
Imogen in the Cave.

D. J. Desvachez's engraving of Graham's painting was published in 1874 in The Art Journal (36:356).In Cymbeline (Act III, scene vi), Imogen, disguised as a boy, takes refuge in a cave, where she is discovered by Belarius, Guiderius, and Arviragus. Belarius exclaims, By Jupiter, an angel! or, if not / An earthly paragon! Behold divineness / No elder than a boy!