The peak of the "Rosicrucianism furore" was reached when two mysterious posters appeared on the walls of Paris in 1622 within a few days of each other.
In his 1618 pamphlet, Pia et Utilissima Admonitio de Fratribus Rosae Crucis, Henrichus Neuhusius wrote that the Rosicrucians departed for the east due to European instability caused by the start of the Thirty Years' War.