The seal is important to the Mithraic Mysteries as it is the first of several made for Mithras in the Middle Ages to mark official documents relating to the Domain of Avalon and the Court of London. This object was awarded to Valerius in the 19th century, who used it to create official documents during Mithras’s extended absence from the city during this period. When Mithras later returned to the city and demoted Valerius, he ensured that the seal was retrieved and passed on to Anne Bowesley as the new Seneschal.