Question: The Celtic Princess fell for The Prince of Rheged who was ruler of what modern day country? 
Sentence (from "Credo (novel)"): Set against the background of venerated Church figures of the period notably St Cuthbert, St Wilfrid and Hilda of Whitby, Bega (i.e. St Bee) experiences all the violence and deprivations of her age.
Relevant evidence: No