Robert Charroux was the best-known pen-name of Robert Grugeau (April 7, 1909 - June 24, 1978). worked for the French post office until becoming a full-time writer of fiction in the early 1940s. He also wrote the scripts for a French comic strip, Atomas, about an atomic-powered superhero, appearing in the weekly magazine Mon Journal in the late 1940s. For the same magazine Charroux wrote a science fiction adventure in serial form, "Prof. Barthelemy's Flying Island." Charroux was a pioneer of the theory of ancient astronauts, publishing at least six non-fiction works in this genre in the last decade of his life, including One Hundred Thousand Years of Man's Unknown History (1963, 1970), Forgotten Worlds (1973), Masters of the World (1974), The Gods Unknown (1974) and Legacy of the Gods (1974).
The influence that Charroux's first work (in its 1963 version) had on Erich Von Däniken's first books (ca. 1966), as well as the influence that Von Däniken's early books had on Charroux, is widely appreciated, but Von Däniken seems to have been equally familiar with an earlier French work, The Morning of the Magicians by Lewis Pauwels and Jacques Bergier (1960), which is likely to have been a direct inspiration for both Charroux and Von Däniken.[1] Charroux's publisher contacted Von Däniken's in March 1968 concerning evidence of plagiarism, with the result that later printings of Chariots of the Gods and Return to the Stars at least mentioned Charroux in the bibliography.
Another similar writer appearing roughly simultaneously with Charroux and considerably pre-dating Von Däniken was prolific British author W. Raymond Drake, whose first book on the topic was published in 1964.
Some see his works as examples of Celticism. Celticism similar to Nordicism was a popular Nationalistic movement in France and Celtic countries in the early 20th century. Robert Chaurroux, for example in his book 'Lost Worlds: Scientific Secrets of the Ancients,' suggested that the Mayans and ancient Peruvians were ancient Celtic migrants. According to Charroux, 'The candle stick of the Andes and the Nasca Lines were created by a pre-celtic civilization, perhaps the same as those who created the Long Man of Wilmington of Sussex in England. He also related the white skinned Gods mentioned in the Popul Vuh to ancient Celts from Hyperborea.