English Standard Version
In the first year of Darius the son of Ahasuerus, by descent a Mede, who was made king over the realm of the Chaldeans--New International Version
In the first year of Darius son of Ahasuerus (a Mede by descent), who was made ruler over the Babylonian kingdom-Catholic Public Domain Version
In the first year of Darius, the son of Ahasuerus, of the offspring of the Medes, who ruled over the kingdom of the Chaldeans