This prophecy had two fulfillments, each complementary to the other. Manasseh, Hezekiah' s actual son, was "carried to Babylon" II Chronicles 33:11, but did not become a eunuch in the palace. Daniel and others, not his actual sons, but of the royal seed Daniel 1:3, and therefore Hezekiah' s descendants, are thought by some to have literally fulfilled the latter part of the prophecy, being eunuchs in the palace of Nebuchadnezzar.
Other Barnes' Notes entries containing 2 Kings 20:18:
2 Kings 20:14
2 Chronicles 32:25
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