I think his only appearance was in one of the last mini-comics, but I don't think he was actually named.
That mini-comic involved He-Man going back in time to stop something related to the snakemen. I can't remember the details but at the end a hero showed up that the Sorceress referred to as 'the greatest wizard in the universe.'
I think the comic was meant to be a 3-part story but the other parts never came out because of the demise of the line.
He-Ro was supposed to get his own line of figures (called the Powers of Grayskull) and a cartoon too I think. There was some prototype figures and some sort of bios written. The bios I think were from a series bible sort of thing for the Powers of Grayskull line, but I can't remember the source although I am sure someone will link to them soon.