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 kingdom of the Chaldaeans;

Daniel 11:1

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

And Daniel went on till the first year of King Cyrus.

Daniel 5:31-1

And Darius the Mede took the kingdom, being then about sixty-two years old.

Daniel 6:28

So this Daniel did well in the kingdom of Darius and in the kingdom 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 went on till the first year of King Cyrus.
Daniel 5:31
And Darius the Mede took the kingdom, being then about sixty-two years old.
Daniel 6:1
Darius was pleased to put over the kingdom a hundred and twenty captains, who were to be all through the kingdom;
Daniel 11:1
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.

Basic English, produced by Mr C. K. Ogden of the Orthological Institute - public domain