William Miller was a Baptist preacher in the early 1800s who, through intensive study of the Bible, concluded that Jesus Christ would return to earth between 1843 and 1844. He began preaching this message and gained many followers known as Millerites. When Christ did not return on the predicted dates, most Millerites were disillusioned in what became known as the Great Disappointment. However, some Millerites, such as Ellen White, continued to believe and eventually established the Seventh-day Adventist Church, with beliefs such as the Sabbath and predictions of Christ's second coming based on visions Ellen claimed to receive. The church continues today with around 20 million members worldwide.