Responses
He might not be a previous king or royal to begin with. He as to be some sort of dark mage or affiliated with one
Oh... I didn't think about that. But seing no one knows his name, it's highly possible.
"No one knows that man's name" hmmm, try counting the souls and count back and match the number to the previous kings, maybe? Or just recite all the named of the kings starting from its founding era (〜￣△￣)〜