A blind servant to the Dark Lord Rogash leads the Olog-Hai of the North under the banner of the Iron Crown. Rogash was battling the forces of the Black Numenorean when the Witch-King arrived to enlist his aid in his conquering schemes. The Witch-King, with his commander Morgomir, decimated his enemies and spoke to the troll. Rogash claimed he intended to unify the forces of Hill Trolls, Olog, and Wargs against the Men of Arnor to which the The Witch-King would offer his assitance in exchange for fealty. Thus the enourmous troll began his service in Angmar bringing his host with him.