 In Switzerland, Geneva was commonly associated with the occult at the time, particularly by Catholics, because it had been a stronghold of Protestantism.Many of those interested in the esoteric traveled from Roman Catholic nations to Switzerland to purchase grimoires or to study with occultists.Soon, grimoires appeared that involved Catholic saints; one example that appeared during the 19th century that became relatively popular, particularly in Spain, was the "Libro de San Cipriano", or "The Book of St. Ciprian", which falsely claimed to date from c. 1000.