In the first year of Darius son of Xerxes, a Mede by descent, who was made ruler over the kingdom of the Chaldeans—
“And I, in the first year of Darius the Mede, stood up to strengthen and protect him.
And Daniel remained there until the first year of King Cyrus.
and Darius the Mede received the kingdom at the age of sixty-two.
So Daniel prospered during the reign of Darius and the reign of Cyrus the Persian.