The Flayed King started out as Tullis Well, I had the map and in my game the Northmen use wells in their religious ceremonies. So I started writing with this in mind and somewhere the concept of The Flayed King originated as I wrote. I heavily borrowed from the story of Odin losing his eye to gain wisdom. This guy didn't fair so well. Throw in a bit of Authurian and Egyptian mythos and this is what I created.
I released it in its current state for Swords & Wizardry Appreciation Day.