The Jagged Crown

Information
This quest belongs to The Imperial Legion quest line.

Quick Walkthrough

 * 1) Speak with Rikke and go to Kovanjund.
 * 2) Join the legionnaires and enter the temple, killing Stormcloaks as you find them.
 * 3) Defeat the draugr in the throne room and take the Jagged Crown.
 * 4) Report back to Tullius.

Detailed Walkthrough
Speak to Rikke, and she will tell you that Ulfric Stormcloak's right hand Galmar Stone-Fist has found what he believes to be the Jagged Crown (which will help to legalize ones claim as High King of Skyrim) in the temple of Kovanjund. Go there and join the waiting soldiers led by Rikke.

Attack together with the legionnaires and wipe out the Stormcloak soldiers waiting outside. Enter the temple and defeat any Stormcloaks in your way. After a couple of rooms, you will get to the Hall of Stories. At the end of the hall there's a sealed doorway, which can only be opened with an Ebony Claw, found on the ground. The code to the door can be found on the back of the claw: fox, moth, dragon.

Next, you will find a room with a barred gate. To open it you must find a lever. It can be found by following the path to your right (while facing the gate), and at the end of that path the lever sits on the wall to your left.

After opening the barred gate, your group will find a room with a draugr sitting on a throne. Kill him and his two companions, and take the Jagged Crown from his head.

Then deliver the crown to Tullius back in Solitude.