Much of the legendary material concerning King Arthur and Joseph of Arimathea's association with Glastonbury is derived from the interpolations into William of Malmesbury's investigation into the Antiquity of Glastonbury, De Antiquitate Glastonie Ecclesia. However, it is William of Malmesbury's mention of the Island of Ineswitrin donated to Glastonbury in 601AD by a king of Devon and this same island's association to the Isle of Ictis discovered by Pytheas, from which tin was sold to the Phoenicians, which links the island to Burgh Island in Devon. Melkin's prophecy indicates that Joseph of Arimathea is buried on Avalon. It is the geometric decryption of Melkin's prophecy which shows us that Joseph of Arimathea, known as a tin merchant in Cornish legend, is still buried on Burgh Island along with the enigmatic duo fassula.