Ahasuerus is a name often associated with the Persian king mentioned in the biblical Book of Esther. He is believed to be a historical figure, possibly identified with Xerxes I, who ruled from 486 to 465 BCE. In the story, Ahasuerus is known for his lavish banquets and his eventual marriage to Esther, a Jewish woman who becomes queen. In the narrative, Ahasuerus plays a crucial role in the salvation of the Jewish people from a plot by Haman, his advisor. The king's decisions and actions lead to the establishment of the Jewish festival of Purim, which celebrates their deliverance and resilience.