The circle of Ceridwen
(Book)

It is the year 871, when England was Angle-Land, and largely fallen to the invading Vikings. Ceridwen, lost in the frozen woods, is discovered by warriors accompanying young Aelfwyn, daughter of a Saxon lord, sold into marriage to a Viking war chief as part of a peace treaty. Becoming fast friends with Aelfwyn, Ceridwen joins the group to their destination- the captured fortress of Four Stones. There, Ceridwen finds living with the enemy affords her unusual freedoms and she find contentment in helping Aelfwyn restore the Four Stones to glory, until a new arrival shatters their peace and sets Ceridwen on an extraordinary adventure to save a man she has never met.