Queen Eleanor and the Fair Rosamond in paintings
Eleanor confronts Rosamond inside the secret bower. The painting below is by late pre-Raphaelite painter Evelyn de Morgan from around 1901 to 1905. She was a fascinating figure in her own right, believing in spiritualism, feminism (she supported the suffragettes) and pacifism. Many of her paintings are women-centered. Note the red roses and cherubs for Eleanor; the white ones for Rosamond.
Below is an earlier Pre-Raphaelite painting, Frederick Sandys' Queen Eleanor (1858), holding the poison chalice and dagger, we presume.
Below is Edward Burne-Jones' Fair Rosamund and Queen Eleanor (1861).
Finally, William Bell Scott's Fair Rosamund in her Bower (1854)