Herne the Huntsman

Herne the Huntsman is a king of the wild fae. He is lord of the hunt and is well known for his sense of fair play and love of hunting challenging prey. However, he is known to hold a grudge. Because of who he holds sway over, his castle is not located in the same location always, but follows him as he hunts. He can summon it in a sufficiently open location.
He appears to have a rivalry with Baba Yaga for reasons unknown.