Everything you need to understand or teach The Hounds of God by Judith Tarr.
The tragedy of intolerance of difference is a motif woven through the whole trilogy. It is a basic theme in this novel. Alf spent earlier years desperately trying to be something he was not, a humble monk. Now that he has dropped the monk's persona, his family and his king must also suffer. They are hounded and tortured, and they finally survive only by accepting banishment.
Much fantasy is built around a struggle...