It is AD 641. Britain is a land of warring tribes, of small kingdoms that firecely guard their sovereignty. A brave and mighty line of warriors had dwindled to one last princess, heiress to the crown: Riemmelth, Queen of the Lightning.
Before he dies, the old king knows he must safeguard Cumbria.
And the only way to do that is to marry Riemmelth, his granddaughter, to one of the hated English.