That moment you find an opera titled "Guenever" by Hubert Parry, where Lyonesse joins Mordred in order to have revenge for Gareth's death by the hand of Lancelot and manages to kill Guinevere, while Lancelot fights against the army she gathered.
But then you realize that Una Taylor, the librettist, destroyed the libretto of the opera because it got rejected so the plot is all that survives. And Hubert Parry was discouraged over the whole thing so he didn't finish the music.














