A foundational belief of conservative Protestants about prophecy and end times, it was conceived in the 19th century by theologian John Nelson Darby and made popular by the Left Behind novels of Tim LaHaye and Jerry Jenkins. It combines two theological views. Dispensationalism dictates that history is a series of eras or dispensations in which God interacts with the world in distinct ways. Premillennialism teaches that Jesus Christ will return before reigning for a thousand years, as prophesied in the New Testament Book of Revelation. Together, the theologies teach that the current era will soon end and usher in the Rapture and battle of Armageddon. Each term may also be used independently.