Anton LaVey, American occultist, founded the Church of Satan (died 1997)

Anton Szandor LaVey was an American writer, musician, and Satanist. He was the founder of the Church of Satan, the philosophy of LaVeyan Satanism, and the concept of Satanism. He authored several books, including The Satanic Bible, The Satanic Rituals, The Satanic Witch, The Devil's Notebook, and Satan Speaks!. In addition, he released three albums, including The Satanic Mass, Satan Takes a Holiday, and Strange Music. He played a minor on-screen role and served as technical advisor for the 1975 film The Devil's Rain and served as host and narrator for Nick Bougas' 1989 mondo film Death Scenes.

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.

April 11 is the 101st day of the year in the Gregorian calendar; 264 days remain until the end of the year.