Elements of Mithraic Mysteries (aka Mithraism) are seemingly apparent in Freemasonry. Mithraic iconography can be seen, for example, in Rosslyn Chapel, near Edinburgh – it is well known for Masonic allegory. What is unsure is the start point and route of any link to Freemasonry from Mithraic beliefs.
In this web site there are proposed decodes for many of the objects on the Pictish Symbol Stones concluding that the Stones were used to pursue a belief I have called Pictish-Mithraism®.
A selection of decodes for Symbols with mystery or belief aspects and decodes for Mithraeum layouts are here with the question “could Pictish-Mithraism be the “link” between Mithraic Mysteries and Freemasonry?“