The Post-Vulgate Cycle reworks the Vulgate Cycle from the end of The Story of Merlin.
The sequel opens with Arthur's unwitting incest with his sister, and his establishment, with Merlin's help, of his title to the kingdom.
The story of the events leading up to the Dolorous Blow is then recounted, as well as its consequences.
A sequence of adventures follows, largely involving Gawain and his brothers; Lancelot appears only at the end of the continuation, as does Perceval, whose story concludes the romance. For a full description of the Post-Vulgate Cycle see the blurb for the complete set.