Sybar Zeebin authored a book on the history of the fall of the Great Underground Empire entitled "The Dark Age of Frobozz," sometime between 883-896 GUE.

Zebbin was the one to put forward the surprising but all-too-believable hypothesis that Dimwit Flathead dictated most of the 5,521 Mareilon Edicts while sound asleep.

SOURCE(S): Zork I (A History of the Great Underground Empire), A History of Quendor