Second Coming
The Second Coming (sometimes called the Second Advent or the Parousia) is a Christian and Islamic belief regarding the future (or past) return of Jesus Christ after his ascension to heaven about two thousand years ago. The idea is based on messianic prophecies and is part of most Christian eschatologies.
Hippolytus of Rome
Hippolytus did not subscribe to the belief that the Second Coming was imminent. He was apparently the first to set a specific date for the second Advent through calculation—AD 500—which was 260 years after his time. He assumed, like Irenaeus his teacher, that inasmuch as God made all things in six days, and these days symbolize a thousand years each, in six thousand years from the creation the end will come. He apparently based his calculation on the Septuagint which had the world beginning about 5500 BC.