An American Baptist preacher, Miller is credited as the founder of Adventism (heir to the Jehovah’s Witnesses). Miller prophesied The End in 1844, based on Bible passage Daniel 8:14: "Unto two thousand and three hundred days; then shall the sanctuary be cleansed." This image is of a Millerite prophetic time chart from 1843, about the prophecies of Daniel and Revelation.
Assuming ‘cleansing’ meant a purifying apocalypse, Miller predicted its occurrence during ‘Advent,’ or Christ’s Second Coming. For Miller, the apocalypse would entail a great fire in which saints would be resurrected and all evil would be annihilated.
In his conferences on the Advent, Miller wrote: "I was thus brought to the solemn conclusion, that in about 25 years from that time 1818 all the affairs of our present state would be wound up.” His final prediction settled on 1844.
Needless to say, the dissolution of his followers on the “the 10th day of the seventh month of the present year, 1844,” is now referred to as “The Great Disappointment.”