So how did I manage this one?
I have been playing off and on since 2007 and finally came back to a barrow quest that has been sitting in my backlog for a while now. I went into The Great Barrow, found the door, and don't have the pre-requisites to get in, so I think that means I don't have the proper key.
We ran around the barrow, killed the two boss guys, got the two halves of the key, but now don't have a quest to combine them.
Did I miss something somewhere or did something change during the years I have no run this quest?