Whose name was Mordecai - The Targum says, "He was the son of Jair, the son of Shimea, the son of Gera, the son of Kish." And "this was the same Shimea that cursed David; and whom David forbade Joab to slay because he saw, in the spirit of prophecy, that he was to be the predecessor of Esther and Mordecai; but when he became old, and incapable of having children, David ordered Solomon to put him to death.
Mordecai, the eunuch Esther 2:7, Esther 2:11, has been conjectured to be the same as Matacas, who, according to Ctesias, was the most powerful of the eunuchs during the latter portion of the reign of Xerxes. Mordecai‘s line of descent is traced from a certain Kish, carried off by Nebuchadnezzar in 598 B.C. - the year of Jeconiah‘s captivity - who was his great-grandfather. The four generations, Kish, Shimei, Jair, Mordecai, correspond to the known generations in other cases, for example:
d High priestskings of PersiaRoyal stock of Judah
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d SeraiahCambysesJeconiah
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d JozadakCyrusSalathiel
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d JeshuaDariusZerubbabel
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d JoiakimXerxesHananiah
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d
The age of Mordecai at the accession of Xerxes may probably have been about 30 or 40; that of Esther, his first cousin, about 20.