Mary Queen of Scots wrote in code.
Roman dodecahedrons may have been used for secret sorcery:
Its magical purpose could be explained by a variety of factors. First, dodecahedrons were mostly found in the Gallo-Roman Empire, an offshoot of the Roman Empire in which magic rituals were known to have taken place. The lack of written records about dodecahedrons may point to a need to use these objects in secret, as divination and magic rituals were punished severely in the Roman Empire. Dodecahedrons have often been found near burial sites, where these rituals may have taken place.