Ahasuerus — A common name to divers kings of Persia. Cambyses the son and successor of Cyrus, was known to be no friend to the Jewish nation.
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.