Charles L. Dodgson is best known as Lewis Carroll, author of the Alice stories.
Clergyman and mathematician at Christ Church College in Oxford, he took up photography aged just 24 when it was still a relatively new art form.
He soon became a well-known gentleman photographer, established his own studio, and created more than 3,000 images, although fewer than 1,000 have survived.
This image was probably taken on 3 July 1863. It shows Annie Rogers on the right dressed as Queen Eleanor, the wife of Henry III, and Mary Jackson on the left as Fair Rosamund, his mistress. Eleanor offers her rival the choice of a dagger or poison, while Fair Rosamund kneels, her hands clasped.
Celebrating 100 years of women's matriculation
Annie Rogers went on to become a campaigner for women's full membership of the University of Oxford, and was one of the first women graduates in 1920.
Take a closer look - click on the images below.