What were the names of the two eunuchs whose plot to kill King Xerxes was uncovered by Mordecai?

Answer: Bigthan and Teresh

Bigthan and Teresh, who guarded the entrance, conspired against the king. Mordecai told Esther, the plot was confirmed, and both were hanged.

“In those days, while Mordecai was sitting at the king’s gate, Bigthan and Teresh, two of the king’s eunuchs who guarded the entrance, grew angry and conspired to assassinate King Xerxes.”— Esther 2:21 (BSB)