Blair, Claude (1987). The History of silver. Ballantine Books. pp. 27–28. ISBN978-0-345-34576-9. «In the Chaourse Treasure a little pepper pot in the form of a squatting negro boy was found, the holes for the pepper are punched in the boy's head. A similar piece found at Nicolaevo, near Pleven in Bulgaria is in the form of a negro boy.»