I haven't a clue, but I have a book called "Who's who and Where's where in the Bible" By Stephen Miller. The last thing said about Esther is:
"....Esther decided to go anyhow. But first, she asked all the Jews to pray for her. Fortunately, the king agreed to see her. Esther told him that Haman was planning to kill her and all her people. The king got angry at Haman. So he ordered his soldiers to hang Haman on the gallows that Haman built for Mordecai. The Jews were saved, thanks to the courage of Esther."
Sorry if that was no help.