Albert Barnes Commentary Esther 10:2

"And all the acts of his power and of his might, and the full account of the greatness of Mordecai, whereunto the king advanced him, are they not written in the book of the chronicles of the kings of Media and Persia?" — Esther 10:2 (ASV)

Power and ... might - In the later years of Xerxes his “power and might” were chiefly shown in the erection of magnificent buildings, especially at Persepolis. He abstained from military expeditions.

Kings of Media and Persia - Media takes precedence over Persia because the kingdom of Media had preceded that of Persia, and in the “book of the Chronicles” its history came first.