Everything you need to understand or teach Daggerspell by Katharine Kerr.
Daggerspell begins the story of Nevyn, a disowned prince, who becomes a master of the magic art of dweomer. He does so to atone for his youthful indiscretion that resulted in the disgrace and death of those nearest to him and his own banishment.
The first part of the story takes place in the seventh century, when Nevyn (then named Prince Galrion) is torn between the girl he loves and his desire to...