Cambyses II
Ahasuerus is also given as the name of a King of Persia in the "Book of Ezra". Modern commentators associate him with Xerxes I who reigned from 486 BC until 465 BC. Other identifications have been made for Cambyses II or with Bardiya (Greek "Smerdis") who reigned (perhaps as an imposter) for seven months between Cambyses II and Darius I.