Cross reference
Daniel 5:31
31 And Darius the Mede received the kingdom, being about threescore and two years old.
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 realm of the Chaldeans,
Daniel 6:1
1 It pleased Darius to set over the kingdom a hundred and twenty satraps, who should be throughout the whole kingdom;