Lot Essay
For a related example in Jerusalem see no. 116 in Hasson, Early Islamic Jewellery, and for an example in Oxford see pp. 49ff in Evans, "Antiquarian researches in Illyricum," Archeologia 48. Four similar disks were re-used on a portable altar of Saint Foy, from Conques, circa 1100 A.D., no. 1 in O'Neil, ed., Enamels of Limoges, 1100-1350.