Daniel 9:1

1. first year of Darius—Cyaxares II, in whose name Cyrus, his nephew, son-in-law, and successor, took Babylon, 538 B.C. The date of this chapter is therefore 537 B.C., a year before Cyrus permitted the Jews to return from exile, and sixty-nine years after Daniel had been carried captive at the beginning of the captivity, 606 B.C.

son of Ahasuerus—called Astyages by XENOPHON. Ahasuerus was a name common to many of the kings of Medo-Persia.

made king—The phrase implies that Darius owed the kingdom not to his own prowess, but to that of another, namely, Cyrus.