Some forums also discuss 2 different scenarios. a) as stated above no monster sat in throne, instead a skeleton with "The Helm of Yngol" which appently relates to a glitch and infinite money however, am unsure.
Issue I have is that once slaying the monster sat in the throne, I take the "Helm of Winterhold" from the chest to gove the Jarl in Winterhold. I wish to leave by the gate in the room which doesn't open, otherwise by the button in the room. The button doesnt "activate" and the gate doesn't open.
In scenario people say that there is a different monster in the room, no monster in the chair, only a skeleton wearing the "Helm of Yngol" which you have to lift from the skeleton in order to get the button to work.
THERE IS NO SKELETON IN MY VERSION
I have found no other connection other than a few posts from people who have given up as the discussion keeps referring to the Coral Claw to open the puzzle door. This is after.