1 In the first year of Darius the son of Ahasuerus, of Median descent, who was made king over the realm of the Chaldeans—
Daniel 9:1 Cross References - VIN
Daniel 1:21
21 And Daniel continued even unto the first year of King Cyrus.
Daniel 5:31-6:1
31 and Darius the Mede took over the kingdom at the age of 62.
Daniel 6:28
28 So Daniel prospered in the reign of Darius and in the reign of Cyrus the Persian.
Daniel 11:1
1 And I in the first year of Darius the Mede had my station to assist and to protect him.