Esther had been living in the citadel of Susa

[Mary Naeem]

Esther had been living in the citadel of Susa, where the king also lived. She was the cousin of a Benjamite named Mordecai, who was also her guardian, having adopted her as his own daughter when her parents died. Mordecai held some type of official position within the Persian government (Esther 2:19). When Esther was chosen as a candidate for queen, Mordecai instructed her not to reveal her Jewish background (verse 10). He also visited the king's harem daily to see how Esther was doing (verse 11).