Teresh was one of two trusted officials (called chamberlains) who guarded King Ahasuerus's (also called Xerxes) private rooms. Teresh and the other guard made a plan to kill the king. However, Mordecai found out about this plan and told Queen Esther. She warned the king, and the two guards were put to death (Esther 2:21–23; 6:2).
Teresh
From Tyndale Bible Dictionary, adapted by Mission Mutual. CC BY-SA 4.0.