User blog comment:Avery D. North/Great Kingdom/@comment-5623290-20160309024809

I agree with you about Raftel and the Great Kingdom being connected!

I believe that Raftel will have the remnants of the ancient civilization that had some sort of ruling government at the time, only to have it destroyed and usurped by the World Government. I think they have something to do with the existance of Devil Fruits, and are the source of the knowledge from the Poneglyphs. Which shows how advanced they actually were.