Daniel 9:1

In the first year of Darius, the son of Ahasuerus, a Mede by birth, who was ruler over the kingdom of the Chaldeans:

In the first year of Darius the Mede, I stood up to strengthen and protect him.

Daniel remained there until the first year of King Cyrus.

and Darius the Mede received the kingdom at the age of 62.

So Daniel prospered during the reign of Darius and the reign of Cyrus the Persian.

Treasury of Scripture Knowledge

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;

Daniel remained there until the first year of King Cyrus.

and Darius the Mede received the kingdom at the age of 62.

Darius decided to appoint 120 satraps over the kingdom, stationed throughout the realm,

In the first year of Darius the Mede, I stood up to strengthen and protect him.