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The Church of Satan (CoS) is a religious organization dedicated to the religion of Satanism as defined by Anton Szandor LaVey. Founded in San Francisco in 1966, by LaVey, it is considered the "oldest satanic religion in continual existence", and more importantly the most influential, inspiring "numerous imitator and breakaway groups". According to the Church, Satanism has been "codified" as "a religion and philosophy" by LaVey and his church. Founded in an era when there was much public interest in the occult, witchcraft and Satanism, the church enjoyed a heyday for several years after its founding. Celebrities attended LaVey's satanic parties and he was invited on talk shows. His Satanic Bible sold nearly a million copies.