21 Daniel continued to the first year of king Cyrus.
Daniel 1:21 Cross References - NSB
Daniel 6:28
28 So Daniel prospered in the reign of Darius, and in the reign of Cyrus the Persian.
Daniel 10:1
1 In the third year of Cyrus king of Persia a matter was revealed to Daniel. Daniels name was also Belteshazzar. The matter was true. There was a great military movement. He understood the matter. He also understood the vision.