Ezra begins with a proclamation from King Cyrus, the king of the Persian Empire, considered the greatest ruling power in the world at that time. Cyrus was a great military leader, bent on universal conquest. Babylon fell before his army - B.C. 538 on the night of Belshazzar’s feast (Daniel. 5:30), and then the ancient dominion of Assyria was also added to his empire (Isaiah 21:2)
. In capturing Babylon, the Jews had new leadership under King Cyrus. The oft-quoted verse in Jeremiah 29 refers to the Jews who were in captivity. In Jeremiah 29:10, Jeremiah prophesies that after 70 years are passed in Babylon, I (God) will visit you because God knew the plans he had toward his people: thoughts of peace and not of evil to bring you an expected end (Jeremiah 29:11). God had plans for the Jews' freedom.
The Jews were no longer in captivity, but they were still in Babylon. If they knew of this prophecy, they probably could not conceive how their lives would turn around; how they would be the beneficiaries of peace