The first Rosicrucian manifesto was influenced by the work of the respected hermetic philosopher Heinrich Khunrath, of Hamburg, author of the Amphitheatrum Sapientiae Aeternae (1609), who was in turn influenced by John Dee, author of the Monas Hieroglyphica (1564).[1]: 51 The invitation to the royal wedding in the Chymical Wedding of Christian Rosenkreutz opens with Dee's philosophical key, the Monas Hieroglyphica symbol. The writer also claimed the brotherhood possessed a book that resembled the works of Paracelsus. Adam Haslmayr a friend of Karl Widemann wrote him a letter about Rosicrucian people who revealed the Theophrastiam[clarification needed] 24 December 1611.[11]