Die Wälder von Albion (Avalon, #2)

The Forest House is a fantasy novel by American writers Marion Zimmer Bradley and Diana L. Paxson, though the latter is uncredited by the publisher. It is a prequel to Bradley's Arthurian novel The Mists of Avalon. The plot of The Forest House is based on that of the opera Norma, relocated from Gaul to Britain, but sharing the basic plot outline of a love affair between a Druidic priestess and a Roman officer.