There were two of this name, one called the Mede, another Darius called Persian. This in the text was he that with Cyrus besieged and took Babylon; he gave himself the name Darius, being before called Nabonnedus. He was chief in the siege, and first in the quarrel against the Chaldees.
Related Commentaries of Daniel 5:31
Daniel 5:31
31 And Darius the Median took the kingdom, being about threescore and two years old.