Esther is Mordecai’s niece is a Myth because they are actually cousins.
Mordecai and cousin Esther
Esther 2:5. Now in the Shushan palace there was a certain Jew, whose name was Mordecai, the son of Jair the son of Shimei the son of Kish, a Benjamite, 6. who had been carried away from Jerusalem with the captivity which had been carried away with Jeconiah king of Judah, whom Nebuchadnezzar the king of Babylon had carried away. 7. And he brought up Hadassah, that is Esther, his uncle’s daughter, for she had neither father nor mother and the maid was pleasing and beautiful, whom Mordecai, when her father and mother were dead, took for his own daughter.
(editor’s note) The widespread misconception that Mordecai was Esther’s uncle originated in some ancient historical interpretations (e.g. Josephus) and has been perpetuated through popular traditions.
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