Ahasuerus
The Cambyses of secular history (529-521 BC); not the Ahasuerus of Esther, who is the Xerxes of secular history (485 BC).
( See Scofield) - (Daniel 5:31).
Related Commentaries of Ezra 4:6
Ezra 4:6
6 And in the reign of Ahasuerus,b in the beginning of his reign, wrote they unto him an accusation against the inhabitants of Judah and Jerusalem.