Obviously we aren't the only ones to ponder this:
Quote:
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GOTHMOG The lieutenant of Minas Morgul and commander of Sauron's army during the Battle of the Pelennor Fields after the fall of the Lord of the Nazgūl. Gothmog may have been a Nazgūl.
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From "A Guide to Middle Earth".
Sorry, guys, I know that's no help.