Godfrid and Gareth grow to respect each other, and Godfrid returns to Gwynedd in The Fallen Princess, on a quest to find the Book of Kells, which has been stolen, and again in The Lost Brother, in search of allies in his conflict with Ottar of Dublin. In both instances, he ends up aiding Gareth and Gwen in their investigations.
By 1148, when The Viking Prince opens, Godfrid's dispute with Ottar, the King of Dublin, has reached a critical moment. Years earlier, Ottar usurped the throne of Dublin, depriving Brodar, Godfrid's older brother, of his birthright. As the summer solstice approaches, Dublin is shocked by the murder of a prominent merchant, but only Prince Godfrid knows that the dead man was also a co-conspirator in his brother's plan to take the throne of Dublin. With death stalking his every move, Godfrid must call upon new friends and old to find the killerand, with their help, uncover a conspiracy stretching beyond Dublin's walls to every kingdom in Ireland.