Private collection, Europe; (Nomos AG, Numismatics, Zurich); purchased 28 May 2014 by NGA.
- Boardman, John, with Diana Scarisbrick, Claudia Wagner, and Erika Zwierlein-Diehl. The Marlborough Gems formerly at Blenheim Palace, Oxfordshire. Oxford, 2009: 224, no. 499, repros. (shell cameo version and example at the Ashmolean Museum, Oxford).
- Warren, Jeremy. Medieval and Renaissance Sculpture. A Catalogue of the Collection in the Ashmolean Museum, Oxford. Oxford, 2014: 3:935-936, no. 399, repro. (example at the Ashmolean).