The Anacalypsis (a.k.a. An Attempt to Draw Aside the Veil of the Saitic Isis or an Inquiry into the Origin of Languages, Nations and Religions) is a huge treatise written by religious historian Godfrey Higgins. It took him more than twenty years of research to discover that there was once an ancient and universal religion, basically the foundation of all other religions that are known today. His theories about Pandeism are still of enormous interest today.