Did you get into Lovis' chamber? If so, jump over the blocked passage to your left as you enter, turn around and check out the guy that didn't quite make it through...
He has a scroll on him that when read will reveal a lever needed to move a platform down to get into Lovis' throne room.
If not, then did you climb up the tower and get past 4 statues that have pressure plates to open a gate? Just after that point the path splits: staying left goes up to the smith and the solution to the Lovis' Loot quest; keeping right goes down a bit, then there is a ladder down to a small platform where you can jump down to the final section of the tower with the door to Lovis' chamber. There are levers past each of the gates to open them (some on ledges you have to jump to), for easier access later.
Once you talk to Lovis (read the book on the stand near the throne), you will get the quest to go to Maxos temple, and the way will be open.