The Spirits' Book is part of the Spiritist Codification, and is regarded as one of the five fundamental works on Spiritism. It was published by the French educator Hippolyte Léon Denizard Rivail, under the pen name of Allan Kardec on April 18, 1857. It was the first and remains the most important Spiritist book, because it addresses in first hand all questions developed subsequently by Allan Kardec.
Hippolyte Léon Denizard Rivail, known by the pen name of Allan Kardec, was a French educator, translator, and writer. He is the author of the five books known as the Spiritist Codification, and the founder of Spiritism.
Kardecist spiritism, also known as Kardecism or Spiritism, is a reincarnationist and spiritualist doctrine established in France in the mid-19th century by writer and educator Hippolyte Léon Denizard Rivail. Kardec considered his doctrine to derive from a Christian perspective. He described a cycle by which a spirit supposedly returns to material existence after the death of the body in which it had dwelled, as well as the evolution it undergoes during this process. Kardecism emerged as a new religious movement in tandem with spiritualism. The notions and practices associated with spiritual communication have been disseminated throughout North America and Europe since the 1850s.