Daniel 5:30

5:30 And in that very night Belshazzar, the Babylonian king, ¹  was killed. ² 

Daniel 6:9

6:9 So King Darius issued the written interdict.

[5:30]  ¹ tn Aram “king of the Chaldeans.”

[5:30]  ² sn The year was 539 B.C. At this time Daniel would have been approximately eighty-one years old. The relevant extra-biblical records describing the fall of Babylon include portions of Herodotus, Xenophon, Berossus (cited in Josephus), the Cyrus Cylinder, and the Babylonian Chronicle.