Originally Posted by
Xloudman
Who even knows Ner'zhul is/was the Lich King? I don't remember there being some major coming out where he's like "ooh look at me, I'm ner'zhul reborn as a stronger being" blah blah. It seems like only KJ, archimonde, anetheron, tichondrius, mephistroth, Arthas, and Bolvar would know who he really was. He's always referred to as the "lich king" after he's encased in the armor.
edit: looking over warcraft 3 mission transcripts, it seems as though Arthas makes mention of ner'zhul being the lich king during his initial assault on undercity to kel'thuzad, it would make sense sylvanas would know as well as she is one of the commanders under arthas during the mission.
edit 2: during the curse of the blood elves campaign, ner'zhul is only mentioned as having opened gateways. Kil'jaden never comments to illidan, kael'thas, or vashj about him being the lich king, and only talks with illidan about destroying "the lich king"