I don't recall if he had a name or not, and I don't have the book on hand to check, but my gut instinct is that he was refered to by a name, not neccessarily his own, but a symbolic name from the prophecy Jarulek was trying to fulfil.
Edit: He may have been the Silent King, but I'd check up on that.
Automatically Appended Next Post: Actually, just checked on Lexicanum, and he was the Undying One, not the Silent King.
Hope this helps!