The story of Purim is told in the Torah, in the Book of Esther.
The key players are the orphan Esher, her husband Xerxes the King of the Persian Empire, Haman the prime minister serving under Xerces, and Esther’s cousin Mordechai, who raised her.
When Esther entered the royal palace to marry the King, her cousin Mordechai directed her not to reveal their Jewish identities.
However, Mordechai incurred the wrath of Haman, the Kings prime minister, by refusing to bow to him.
Jews do not bow, not even to God.
Haman chose a date, the 13th of Adar, to exterminate all Jews in the Persian Empire.
Mordechai became aware of Hamans’s plan to exterminate the Jewish people. He persuaded his cousin Esther, at the risk of their lives, to inform her husband the King, of her Jewish identity and of Hamans plot.
The King was enraged at Haman’s deception, and hanged Haman on the gallows.
Mordechai, and the Jews were granted the right to defend themselves, leading to a great victory and the establishment of the holiday of Purim.