The apparent historical difficulties, the internal inconsistencies, the pronounced symmetry of themes and events, the plenitude of quoted dialogue, and the gross exaggeration in the reporting of numbers (involving time, money, and people) all point to Esther as a work of fiction, its vivid characters (except for Xerxes) being the product of the author's creative imagination. There is no reference to known historical events in the story; a general consensus, though this consensus has been challenged, has maintained that the narrative of "Esther" was invented in order to provide an aetiology for Purim, and the name Ahasuerus is usually understood to refer to a fictionalized Xerxes I, who ruled the Achaemenid Empire between 486 and 465 BCE.