He tells the King that Elsa has broken her promise and he discloses his identity by telling the story of the Holy Grail , on Monsalvat , and reveals himself as Lohengrin , Knight of the Holy Grail and son of King Parsifal sent to protect an unjustly accused woman .
He tells the story of the Holy Grail and says that he is Lohengrin , Knight of the Holy Grail and son of King Parsifal .