The Forests of Avalon - Marion Zimmer Bradley - Bog

The Roman grip on their empire was slackening; the Druidic Order - far stronger that the tiny Christian sect - was itself in turmoil. Caught in the centre of the conflict is a young British girl of druidic family, chosen to be a priestess, and a roman tribune, ambitious for power but - as the son of a British mother - torn between two cultures.