This article is from the Tolkien Newsgroups FAQ, by Steuard Jensen sbjensen@midway.uchicago.edu with numerous contributions by others.
Gothmog (who shares his name with the Lord of Balrogs in the First
Age) took command of Sauron's forces after the Witch-king was
destroyed. Some believe that like the Mouth of Sauron he was human,
while others claim that so responsible a position in Minas Morgul would
only be given to another Nazgul. Several other possibilities also
arise repeatedly. There seems to be no explicit evidence for any
particular answer.
 
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