Darius the Median - that is, Cyaxares II, the son and successor of Astyages, 569-536 b.c. Though Koresh, or Cyrus, was leader of the assault, yet all was done in the name of Darius; therefore, he alone is mentioned here; but Dan 6:28 shows Daniel was not ignorant of Cyrus’ share in the capture of Babylon. Isa 13:17; Isa 21:2, confirm Daniel in making the Medes the leading nation in destroying Babylon. So also Jer 51:11, Jer 51:28. Herodotus, on the other hand, omits mentioning Darius, as that king, being weak and sensual, gave up all the authority to his energetic nephew, Cyrus [Xenophon, Cyropaedia, 1.5; 8.7].
threescore and two years old - This agrees with Xenophon [Cyropaedia, 8.5, 19], as to Cyaxares II.