Hieronymus Hopfer, The Great Cannon, 1500, etching, National Gallery of Art, Washington. https://dartabase.art/cite/nga/8002

Hieronymus Hopfer, Erasmus of Rotterdam, 1515, etching, National Gallery of Art, Washington. https://dartabase.art/cite/nga/8004

Hieronymus Hopfer, Karl V, 1520–1521, Radering, Statens Museum for Kunst (National Gallery of Denmark), Copenhagen. https://dartabase.art/cite/smk/KKS4055