The Hebrew form of the Persian royal name Xerxes I. He ruled 127 provinces from India to Ethiopia and is the king in the book of Esther.
Ahasuerus (historically Xerxes I, 486-465 BC) is the king through whom God preserved the Jewish people from Haman's genocide. The book of Esther never names God -- yet His fingerprints are on every 'coincidence': the king's sleepless night, the chance reading of Mordecai's record, Esther's courage. 'All things work together for good' (Romans 8:28).