Like the article in the Encyclopedia of Arda says, he rose to power as a lord in the south under Sauron. Some non-Tolkien sources have taken him to have become a Nazgûl, but that is impossible since these were around long before Sauron went to Númenor.
Unfortunately, the New Shadow breaks off before we get to know how Herumor is. Chances are it's just a recycled name; since Herumor 'lord of darkness' would appear to be a fitting name for any dark lord.
|