Alfonso VI taking the Oath of Santa Gadea — In the middle of the scene, Alfonso VI (with red cape) is swearing with his right hand on the Bible that he did not take part in the murder of his brother Sancho II, while El Cid stands as a witness in front of him.
Photo Credit: by Marcos Giráldez de Acosta (1864) - Public Domain, https://commons.wikimedia.org/w/index.php?curid=48881164