Enemy of God
Bernard Cornwell
 Chapter One: Enemy of God starts off where "The Winter King" left off, with Arthur's unexpected victory over the combined armies of Powys and Siluria. Both Gorfyddyd, king of Powys, and Gundleus, king of Siluria, are dead. Gorfyddyd's son, Cuneglas, shares Arthur's desire for peace and also his dream of an alliance between the British kingdoms that will destroy their common enemies, the Saxons. Derfel is ordered to follow Cuneglas to Caer Sws (Caersws), capital of Powys, where the Edling is to be crowned king. As for the vacant Silurian throne, Arthur tells Derfel of his plan to make Lancelot king and marry him to the princess of Powys, Ceinwyn, thus cementing the alliance between Dumnonia, Powys and Siluria. Derfel does not reveal that he is in love with Ceinwyn, and want her for himself, and goes to Caer Sws, and witnesses Cuneglas' acclamation. Days later, Arthur arrives with his court, including Guinevere and Lancelot. Derfel watches with frustration Ceinwyn's betrothal to Lancelot, and her apparent happiness with the marriage. Derfel speaks with Merlin, and Merlin tells him that Arthur wants him to marry Gwenhwyvach, Guinevere's plain and apathic sister. Merlin asks Derfel to meet him and Nimue late that night on a hilltop, where Merlin has Derfel drink a hallucinogenic potion. Derfel hallucinates about Ceinwyn and sees a dark road and a ghoul, and he describes his vision to Merlin. Merlin tells him the ghoul was Diwrnach, a vicious Irish king of Lleyn, and he also asks Derfel to accompany him on the quest (which also requires the presence of a virgin) for a magical Cauldron, one of the Thirteen Treasures of the Island of Britain, but Derfel is committed to taking his men to aid Arthur in his campaign to drive the Saxons out of eastern Britain. Merlin gives Derfel a bone, and tells him that all he has to do is break it and his wish will be granted, namely that Ceinwyn will choose him over Lancelot, but warns that if he breaks it, he will be bound to Merlin's quest.