Cross reference
Daniel 9:1
1 In the first year of Darius the son of Ahasuerus, of the seed of the Medes, which was made king over the realm of the Chaldeans;
Daniel 11:1
1 Also I in the first year of Darius the Mede, even I, stood to confirm and to strengthen him.
Daniel 1:21
21 And Daniel continued even unto the first year of king Cyrus.
Daniel 5:31-1
31 And Darius the Median took the kingdom, being about threescore and two years old.
1 It pleased Darius to set over the kingdom an hundred and twenty princes, which should be over the whole kingdom;
Daniel 6:28
28 So this Daniel prospered in the reign of Darius, and in the reign of Cyrus the Persian.