.. The tattered banners

• Wolf banner ( It is at Eastern Ramparts, stairs down and right. )
• Raven banner ( At the main courtyard. Left from the well. )
• Bear banner ( In the dungeons. Left from the door. )
• Stag banner ( In the supply building tunnels. Left from the torch room. )

Here are all four in one picture:

Look at the statues in the dining hall. The banner design matches those statues.