The availability of coins and the widely-held belief in the special powers associated with the emperor's portrait resulted in coins being used as amulets. Such coins are pierced so that they can be suspended on a chain and worn around the neck, like this follis of Justinian I. It has an engraved inscription around its outer edge that was added at a later date: "+ Lord protect the wearer." Pierced Follis of Justinian I (527-565) Inscribed: "+ Lord protect the wearer" London, Collection of Simon Bendall Photo: Courtesy of Spink & Sons, London