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Anabaptists of Munster -- A group of Anabaptists, one of the many radical sects that emerged following the Protestant Reformation, assumed control of the German town of Munster in the 1530s and hailed it as a New Jerusalem awaiting the return of Christ. Their hold over Munster ended with a bloody siege in 1535.
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The Millerites -- Based off what he called careful study of his Bible, New England farmer named William Miller led thousands of "Millerites" to believe that the world would end on April 23, 1843. When it didn't, the group disbanded and some of them formed what is now the Seventh Day Adventists.
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William Branham -- In 1963, Pentecostal pastor William Branham claimed he met with seven angels who revealed to him the meaning of the seven seals of the Book of Revelation. He predicted that Jesus would return to Earth in 1977, but did not live to see the day. He was killed by a drunk driver in 1965.