Your question is vague and lacking necessary detail to assist. Is it for a quest? I have completed WT and don't recall a "throne room" unless you count the end of Nordstrund in the sealing chamber.
Not having access to the throne room is usually a level deficiency. You have to be level 40 to enter the throne room. If you are specifically asking your question is reference to the book quest, it will be near the king when you gain access to the throne room for your final quest series in Grizzleheim.
