Fraternitas Rosae Crucis
Fraternitas Rosae Crucis AKA The Brotherhood of the Rose Cross aka the FRC in France, refered to in Britian as the Fratres Lucis AKA Brothers of the Light or sometimes "Fiat Lux" AKA Let There Be Light".
Long after the original excitement from the 3 anonymous Rosicrucian manuscripts circulated in Europe and Britain, the idea of a secret Band of Brothers working with Magic to shepard the Old World of Darkness into a new world of Light kept hope alive that civilization was a progressive force, and the Future might be better than the Past or Present.
That these documents were circulated soon after Luther and the Protestant Revolution had freed much of Germany, England and Holland from the Inquisition and superstition the Catholic Church. Rosicrucian beginnings in Germany stem in part from the belief that a New Christ, a Protestant Christ, would emerge from the German kingdoms and lead the fight against the remains of the Church. As the 30 Years War dragged on (1618–1648), this prophecy was greatly encouraged among the more liberal intellectuals most likely to be the Inquisition's victims. The Supernova of 1604 was considered another Star of the Savior, and the coming of Christ on Earth, the End of Things and the Heavenly Ascent. Any Child born then would have been just grown to that age's idea of Manhood. Such Teachers as Josephus Quercetanus, Helisaeus Roeslin, Simon Studion, Tobias Hess and his student Johannes Valentinus Andreae AKA Christian Rosenkruz all embraced this concept, while the more scientific Johannes Kepler who discovered it only wrote cautiously about any potential meanings, to avoid being burnt as a heretic, as was his friend Giordano Bruno several years before the new Star appeared.
But France was still under the Catholic Church, and Rosicrucians were subject to torture and death.
Much of French occultism became hidden within the Masonic Lodges, where personal oaths of secrecy protected Brothers and their ideas and allowed free expression. The later 1800s brought about an Occult Explosion throughout The New and Old Worlds. In America after the Civil War, the upstate New York area became the breeding grounds of many new religions, including the Mormons, the Quakers, the Shakers, the Millerists (Seventh Day Adventists and Jehovah Witnesses). European idealists were moving to America to establish Communes and Societies, in New England, Georgia and Pennsylvania. And from the slavery of the South arose a mulatto Magician named P. B. Randolph.
The traditional enmity of the French to the Germans (and, after Napoleon, vice versa)slowed the transmission of the German Rosicrucian philosophy into (still mostly Catholic) France. It found a back door in America, where they had been put into practice in the Brotherhood of Eulis. Irt's founder, P. B. Randolph brought the teachings of his Brotherhood to Europe and there joined French Magician Eliphas Levi in reviving the Rosicrucians and organizing the Fraternitas Rosae Crucis (FRC).
Papus, Eliphas Levi's student, was a master organizer, and created several new Secrete Rosicrucian Societies in addition to formalizing the teachings of his Master. In this he was joined by Alexandre Saint-Yves d'Alveydre, Antoine Fabre d'Olivet, Stanislas de Guaita Emile Dantinne and Joséphin Péladan. in the 1930s Max Theon rephrased it into the Philosophie Cosmique, in which he involved Peter Davidson and Thomas Burgoyne when forming the Hermetic Brotherhood of Luxor.
English Magician Frederick Hockley received information and perhaps initiation from this group, whom he called Fratres Lucis AKA Brothers of the Light or sometimes "Fiat Lux" AKA Let There Be Light". And his disciple Kenneth R. H. Mackenzie left coded manuscript of rituals to his wife when he passed on, the cypher manuscript of the Golden Dawn.