Albert Barnes Commentary Esther 1:14

"and the next unto him were Carshena, Shethar, Admatha, Tarshish, Meres, Marsena, and Memucan, the seven princes of Persia and Media, who saw the king`s face, and sat first in the kingdom)," — Esther 1:14 (ASV)

In Marsena we may perhaps recognize the famous Mardonius, and in Admatha, Xerxes’ uncle, Artabanus.

The seven princes - There were seven families of the first rank in Persia, from which alone the king could take his wives. Their chiefs were entitled to have free access to the monarch’s person. See the margin reference note.