Esther comes into the story around about 480 BC or so, during the reign of King Xerxes.
Remember that the angel’s prophecy to Daniel stated who the next few Persian kings would be, with the fourth being particularly special. Xerxes I became the greatest and richest of the Medo-Persian kings.
how many Medo-Persian kings will be left before the empire’s demise. Up to this point, Cyrus and his Medo-Persian Empire had defeated Babylon in 539 BC.
Cyrus particularly stands out amazingly as the fulfillment of an earlier prophecy.
Cyrus died of a war wound, leaving Darius the Mede in charge.
That’s why the messenger angel in Daniel 11:1 states, So, we have an actual time frame for when Daniel wrote this chapter.