Everything you need to understand or teach Roma Mater by Poul Anderson.
The nine witch queens of Ys have cast spells to lure an able leader to their city—someone who will replace the hated Colconor as king of the city and who will make a good leader. The city has a dark custom, dating back ages to the founding of the Nine; the king must always be an outsider, and he must defend to the death in handto-hand combat his right to be...