In a letter dated 1824 or 1825 Gustav Waagen, later Director of the Berlin Museums, gave his interpretation of Latin inscriptions he had seen on the original frame of the portrait, which was subsequently lost.
I et brev dateret til 1824 eller 1825 forsøgte Gustav Waagen, den senere direktør for Berlinmuseerne, at fortolke den latininskription han havde set på portrættets oprindelige ramme, der efterfølgende var gået tabt.