Gothmog the Orc

Gothmog the Orc is the Orc general of Minas Morgûl and leader of the Witch-King´s host.He is a huge one-armed anmd deformed Orc with brownish skin and the only Orc known so far to hold the position of Sauron´s Gothmog (the other known Gothmogs having been one Nazgûl and one Half-Troll.

speculations
There are speculations that Gothmog the Orc really is a Half-Troll, an Orc-Troll crossbreed, and identical with Gothmog the Troll who held the position of Sauron´s Gothmog at 1650 TA.Other speculations are that Gothmog is actually a Maia in orc-form and one of the last Boldogs or an Ogre.