abstract: Graffiti at the Arena Chapel and Issogne Castle engage in conversation with the frescoes and the functions of the spaces. These marks produce discussions of cultural issues. The graffiti found in the chapel and castle can be considered ritual and performative acts, visually documenting conversations among diverse audiences in the late medieval and early modern periods. Scholars of the Arena Chapel frescoes have studied the intricate painted iconography. Adding graffiti to the analysis of the chapel allows for a different interpretation of one of the most famous fresco programs. Abundant marks appear on figures in the scene of Hell in the Last Judgment, and are analyzed in terms of the medieval concepts of optics and sight, as well as in respect to class. At Issogne Castle, visitors inscribed graffiti on figures and scenes to represent their responses to key social issues. These included questions of class and occupation, along with political and religious concerns. Contextualizing graffiti in this way enables contemporary scholars to uncover a more complex and subtle understanding of the conversations on the wall in the late medieval and early modern periods through case studies of two monuments of art history. / Dissertation/Thesis / M.A. Art History 2012