Daniel 9:1

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 11:1

Also I, in the first year of Darius the Mede, even I, stood to confirm and to strengthen him.

Daniel 1:21

And Daniel continued even to the first year of king Cyrus.

Daniel 5:31-1

And Darius the Median took the kingdom, being about sixty and two years old.

Daniel 6:28

So this Daniel prospered in the reign of Darius, and in the reign of Cyrus the Persian.

Treasury of Scripture Knowledge

Summary

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;

Bible References

Darius

Daniel 1:21
And Daniel continued even to the first year of king Cyrus.
Daniel 5:31
And Darius the Median took the kingdom, being about sixty and two years old.
Daniel 6:1
It pleased Darius to set over the kingdom a hundred and twenty princes, who should be over the whole kingdom;
Daniel 11:1
Also I, in the first year of Darius the Mede, even I, stood to confirm and to strengthen him.