1 In the first year of Darius, son of Ahasuerus, of the seed of the Medes, who hath been made king over the kingdom of the Chaldeans,
Daniel 9:1 Cross References - YLT
Daniel 1:21
21 And Daniel is unto the first year of Cyrus the king.
Daniel 5:31-6:1
31 and Darius the Mede hath received the kingdom, when a son of sixty and two years.
Daniel 6:28
28 And this Daniel hath 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, my standing is for a strengthener, and for a stronghold to him;