Colbert the Mad
He has a brother who was killed by shades near Amon Amrûn while treasure hunting. Colbert isn't actually mad, but seems to have been under a curse of some sort. After returning the treasure stolen by his brother, Colbert's mind clears.
He reveals that he was a member of a larger group of treasure hunters who can be found at their camp to the north.
After freeing him from his madness, you can find him at the camp.
-  Turn East, Never North
-  Eccentric Company
-  Hunting Olnathron
-  Treasures from the Fields
-  The Madman's Tale
Colbert the Mad is based off of Stephen Colbert, well-known for belief that bears are the #1 threat to America.