In the first year of Darius son of Ahasuerus, who was of Median descent and who had been appointed king over the Babylonian empire –

And in the first year of Darius the Mede, I stood to strengthen him and to provide protection for him.)

In the third year of the reign of King Jehoiakim of Judah, King Nebuchadnezzar of Babylon advanced against Jerusalem and laid it under siege.

In the first year of King Belshazzar of Babylon, Daniel had a dream filled with visions while he was lying on his bed. Then he wrote down the dream in summary fashion.

In the third year of King Belshazzar’s reign, a vision appeared to me, Daniel, after the one that had appeared to me previously.

in the first year of his reign I, Daniel, came to understand from the sacred books that, according to the word of the LORD disclosed to the prophet Jeremiah, the years for the fulfilling of the desolation of Jerusalem were seventy in number.

In the third year of King Cyrus of Persia a message was revealed to Daniel (who was also called Belteshazzar). This message was true and concerned a great war. He understood the message and gained insight by the vision.