THE GOTHIC NOVEL (G.N), the first horror

Who invented the G.N?                                                          Horace Walpole

What was the first G.N?
The Castle of Otranto

 When was it first published?                                             1764

 Which basic elements of horror didn’t you include on your list?  I didn't incloude moans, crazed laughter, baying of distant dogs, footsteps,...