The Millennium is the 1,000-year period of peace and righteousness following the Second Coming of Jesus Christ, who will reign over the earth during that time. Is this true?
THE THOUSAND-YEAR REIGN OF CHRIST: Is It  Premillennialism, Postmillennialism, and Amillennialism?
Most Christian millennialist thinking is based upon the Book of Revelation, specifically Revelation 20, which describes the vision of an angel who descended from heaven with a large chain and a key to a bottomless pit and captured Satan, imprisoning him for a thousand years.