"Ancient Mystical Order Rosae Crucis - 'The Rosicrucians'," provides survey of Rosicrucianism, its "...tenants, teachings and influential thinkers," according to You Tube summary. Three classical writings that brought wide attention to order in 17th Century follow: "Fama Fraternitatis RC" (published
in 1614), "Confessio Fraternitatis RC" (1615) and “Chemical Wedding of Christian Rosycross“ (1616). In another article, "The Origins of the Rosicrucians," identifies Christian Rosycross as "...the prototype of a man who lives the path of Christian initiation beginning with the first vocation as a pupil and culminating with the resurrection of the spirit-soul. The 'Alchemical Wedding' is really the spiritual wedding of his own, new-born soul with the spirit of Christ, thus forming an immortal man with an immortal body."
A fourth manifesto of Rosicrucian writing, "Posito Fraternitatis Rose Crucis," has been released more recently:
"The public presence of the Rosicrucians in Western Europe was made known through the publication of three manifestos. AMORC introduced a fourth manifesto, the Positio Fraternitatis Rosæ Crucis at an AMORC convention in Sweden in August 2001. The Positio offers AMORC's observations on problems in the modern world, along with proposed solutions. The Positio closes with an invocation that expresses what it calls 'Rosicrucian Utopia'," informs Wikipedia.
Rosicrucian Order is still very much alive, teaching universal wisdom.