Haman (Also known as Haman the Agagite המן האגגי, or Haman the evil המן הרשע) is the main antagonist in the Book of Esther, who, according to Old Testament tradition, was a 5th Century BC noble and vizier of the Persian empire under King Ahasuerus, traditionally identified as Artaxerxes II.
As his name indicates, Haman was a descendant of Agag, the king of the Amalekites, a people who were wiped out in certain areas by King Saul and David, supposedly by God's command.
In the story, Haman and his wife Zeresh instigate a plot to kill all of the Jews of ancient Persia. Haman attempts to convince Ahasuerus to order the killing of Mordecai and all the Jews of the lands he ruled.
The plot is foiled by Queen Esther, the king's recent wife, who is herself a Jew. Haman is hanged from the gallows that had originally been built to hang Mordechai. The dead bodies of his ten sons Parshandatha, Dalphon, Aspatha, Poratha, Adalia, Aridatha, Parmashta, Arisai, Aridai and Vaizatha (or Vajezatha), are also hanged after they die in battle trying to kill the Jews (Esther 9:5-14).
Queen Esther, learning that her people are in danger, risks her own life to spare the Jews living in Ancient Persia.