Post-millennialism is one of three major theories about the Biblical millennium, the other two being Pre-millennialism or A-millennialism. These three descriptors are actually adjectives describing the Return of Christ with reference to the timing of the 1000 years of the “Millennium”. Post-Millennialism pictures the 1000 years as being a successful period of Church influence such as to bring about the dawn of a better world. Initially, in times of conservative Christianity, this was seen as due to the success of Christian mission introducing “a bright new world of peace and happiness”. Later Post-millennialism, still with an optimistic note, but with more liberal understanding of the influence of the Church, explained the expected uplift as due to scientific advancement, ethical improvement of society and/or evolution. Post-millennialism of this sort sees the societal uplift due to causes such as evolution or technological advancement. Post-millennialism today sometimes seeks to fit in with Liberal theology reinterpreting the Gospel, with the uplift as caused by social or technological progress. Finally, when focus is taken back to what the Book of Revelation actually says, Revelation 20:4-6 describes events that seem to contradict post-millennial interpretations.