S1, E6: Arthur suggests that as a show of faith, he marry Gorfydds daughter, Ceinwyn. He and Derfel travel to Powys along with Gundleus and Gorfydd. Arthur meets a fascinating and beguiling figure, before he and Ceinwyn are betrothed.

Starring Eddie Marsan, Nathaniel Martello-White, Valene Kane
Director Otto Bathurst, Farren Blackburn