Hastings' Dictionary of the Bible
AHASUERUS (old Pers. KhshayÃ¢rshÃ¢ ). The Persian king (b.c. 485 465) known to Greek history as Xerxes . Complaints against the Jews were addressed to him ( Ezra 4:6 ). It is he who figures in the Book of Esther; Daniel 9:1 erroneously makes him father of Darius the Mede, confusing the latter with Darius Hystaspis, the father of Xerxes. The Ahasuerus of Tob 14:15 is Cyaxares.
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Hastings, James. Entry for 'Ahasuerus'. Hastings' Dictionary of the Bible. https://www.studylight.org/dictionaries/eng/hdb/a/ahasuerus.html. 1909.