This vision occurs, we read, in the first year of Belshazzar, about ten years before 539 BC, the fall of Babylon, and we have gone back in time from the previous chapter. The seventy years of captivity in Babylon are coming to an end and at such a time the Lord is going to reveal to Daniel how long there is to go before Messiah comes, and some of the great events of history that will be unfolded.