No, I shouldn't have said "retelling". I'm actually setting the main story at the time the Grail Quest is in progress, and then I have to develop the rest of the story from there, as an addition to the main story. The thing is that I don't know the order or "synchronization" of events here. Where was Lancelot at the time of the Quest? Where was Guinevere, Mordred and Arthur? Is Galahad there? Stuff like that.