Castle Roogna (The Magic of Xanth, No. 3)

Once upon a past. . . .

Millie had been a ghost for 800 years. But now, restored by the magic of Xanth, she was again a maddeningly desirable woman. She could have had any man she wanted . . . except the one she did want, Jonathan the zombie. To grant Millie her desire, and to prove his right to rule Xanth in the future, young Magician Dor embarked on a quest for the elixir which would restore Jonathan to full life. 

But the potion could be found only in the past . . . so, through a magic tapestry, to the past he went, taking over the body of a barbarian warrior. The first person he encountered there was Jumper, a giant spider—a nightmare monster, but a staunch friend and much-needed ally in peril-haunted, ancient Xanth. 

Then Dor met Millie—800 years younger, but just as lovely. And he realized that, in his new body, he was no longer twelve years old . . .

Piers Anthony, sometimes called Pier Xanthony, is the pseudonym of a Mundane character who was born in England in 1934, came to America in 1940, was naturalized in 1958, and moved to Xanth in 1977. His first story was published in 1963, and his first novel, Chthon, in 1967. His first Xanth novel, A Spell for Chameleon, won the August Derleth Fantasy Award as the best novel for 1977, and his fantasy novels began placing on the New York Times bestseller list with Ogre, Ogre. He shifted from writing in pencil to writing on the computer, and Golem in the Gears was his first novel created on the machine; naturally, the computer found its way into Xanth.