User blog comment:Noctosphere/so? who's the first demon?/@comment-31564841-20160809120930

Lilith was the First Demon but Cain was the first Knight Of hell. He didn't get the Mark until after Lucifer went against God. You also need to remember that the person who has the Mark of Cain has to die before it turns them into a demon for the first time. Lilith was created after Lucifer was cast into the cage but before Cain either got the Mark or Became a demon