The lovely, orphaned Esther, the ward of her relative Mordecai, a Jew in exile. Her story of saving her people, starts here. It is the story of how God uses the most unlikely, fragile and unimportant people to carry out his will. Also she was responsible for cutting taxes!

 the king loved Esther more than all the women, and she won grace and favor in his sight more than all the virgins, so that he set the royal crown on her head and made her queen instead of Vashti. Then the king gave a great feast for all his officials and servants; it was Esther's feast. He also granted a remission of taxes to the provinces and gave gifts with royal generosity.

Esther 2:17-18 (ESV) Bible Gateway link to passage