Cross reference
Daniel 9:1
1 In the first year of Darius, the son of Ahasuerus, of the seed of the Medes, who was made king over the kingdom of the Chaldaeans;
Daniel 11:1
1 And as for me, in the first year of Darius the Mede I was on his side to make his position safe and make him strong.
Daniel 1:21
21 And Daniel went on till the first year of King Cyrus.
Daniel 5:31-1
1 And Darius the Mede took the kingdom, being then about sixty-two years old.
Daniel 6:28
28 He gives salvation and makes men free from danger, and does signs and wonders in heaven and earth, who has kept Daniel safe from the power of the lions.