Rosicrucians

Rosicrucians belong to a philosophical secret society said to have been founded in late medieval Germany by Christian Rosenkreuz.

It holds a doctrine "built on esoteric truths of the ancient past," which "concealed from the average man, provide insight into nature, the physical universe and the spiritual realm."

Rosicrucianism is symbolized by the Rosy Cross or Rose Cross.

At one time the Rosicrucians advertised extensively in the pulp magazines often with advertisements on the back page asking if you knew what these great thinkers had in common. (Besides being dead.)