Perugino, approximately 1450-1523. Christ gives the keys of the kingdom to Peter, detail, from Art in the Christian Tradition, a project of the Vanderbilt Divinity Library, Nashville, TN. https://diglib.library.vanderbilt.edu/act-imagelink.pl?RC=55925 [retrieved August 23, 2020]. Original source: https://commons.wikimedia.org/wiki/File:Entrega_de_las_llaves_a_San_Pedro_(Perugino).jpg.