Rosicrucianism

The term Rosicrucian (symbol: the Rose Cross) describes a secret society of mystics, allegedly formed in late mediaeval Germany, holding 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. "

The Temple of the Rose Cross, Teophilus Schweighardt Constantiens, 1618.

In later centuries many esoteric societies have claimed to derive their doctrines, in whole or in part, from the original Rosicrucians. Several modern societies, which date the beginning of the Order to earlier centuries, have been formed for the study of Rosicrucianism and allied subjects.

Source: Wikipedia