User blog comment:Zack Tan/Volume 7 Intermission/@comment-26968629-20150908025908/@comment-76.218.192.169-20150908200203

Its been said that ainz might had known the 8 greed kings. Since ainz asked about a castle floating in the sky to sebas. I checked the light novel and he's never been told the name"8greed kings" just the 6 demon gods and 13 heroes.