 Because of this, Guinevere tells Lancelot she knows of his secret love for her and urges him to marry Elaine.Lancelot proposes to Elaine and asks Arthur to let him go to fight the Picts on the Scottish borders.One night, Lancelot and Elaine are visited by Percival, who relates how a heavenly vision instructed him to go on a quest for the Holy Grail, the cup from which Christ drank at the Last Supper.