King James Version
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;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-