Rab MacGibbon is Cross-Collections Curator at the National Portrait Gallery, London. He is the author of Icons and Identities (2021), and a contributor to Love Stories: Art, Passion & Tragedy (2020), Elizabethan Treasures: Miniatures from Hilliard to Oliver (2019) and The Lost Prince: The Life & Death of Henry Stuart (2012). Dr Nicholas Cullinan is Director of the National Portrait Gallery, London.