Fausset's Bible Dictionary
A eunuch or chamberlain in Josiah's court, by whose chamber at the entering in of Jehovah's house, in the suburbs, were the horses sacred to the sun; these Josiah took away and burned the sun chariots with fire (2 Kings 23:11).
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Fausset, Andrew R. Entry for 'Nathan-Melech'. Fausset's Bible Dictionary. https://www.studylight.org/dictionaries/eng/fbd/n/nathan-melech.html. 1949.