Piers Anthony

Centaur Aisle is the fourth book of the Xanth series by Piers Anthony. King Trent has left Xanth on a mission of trade to Mundania and has left Dor as temporary king. When Trent fails to return after some time, Dor must find a way to rescue Trent. He is informed that the means to rescue Trent lies to the south on …

Castle Roogna is the third book of the Xanth series by Piers Anthony. The castle itself is also the residence of the present King of Xanth.

Blue Adept is a book published in 1981 that was written by Piers Anthony.