Daniel 1:21

Now Daniel lived on until the first ¹  year of Cyrus the king.

Da 6:28; Da 10:1

¹ sn The Persian king Cyrus’ first year in control of Babylon was 539 B.C. Daniel actually lived beyond the first year of Cyrus, as is clear from 10:1. The purpose of the statement in 1:21 is merely to say that Daniel’s life spanned the entire period of the neo-Babylonian empire. His life span also included the early years of the Persian control of Babylon. However, by that time his age was quite advanced; he probably died sometime in the 530’s B.C.