Conspiracies inside the palace were ordinary occurrences in Persia. Xerxes was ultimately murdered by Artabanus, the captain of the guard, and Aspamitras, a chamberlain and eunuch.
Related Commentaries of Esther 2:21
Esther 2:21
21 In those days, while Mordecai sat in the king's gate, two of the king's chamberlains, Bigthane and Teresh, of those which kept the door, were wroth, and sought to lay hand on the king Ahasuerus.