At the height of his power the Necromancer of Dol Guldur had become a powerful ruler, dominating southern and central Mirkwood as well as the lands east of Mirkwood, the Eastbight, and most of the Brown Lands south of it and even parts of the Anduin Vales west of it.Supreme Head of the Necromancer's Dominion (S."Dor Guldur") was the Necromancer, who never appeared openly and whose identity was a well kept secret, many observers and even some of Dor Guldur 's Citizens believed the Necromancer to be identical with the Gonon-u-Kazgûmhoth or the Khaunûlor-u-Thrûnga Burlauga.