Lord Valentine's Castle - Robert Silverberg

Valentine, a wanderer who knows nothing except his name, finds himself on the fringes of a great city, and joins a troupe of jugglers and acrobats; gradually, he remembers that he is the Coronal Valentine, executive ruler of the vast world of Majipoor, and all its peoples, human and otherwise...

Valentine's journey is a long one, a tour through a series of magnificent environments. Fields of predatory plants give way to impossibly wide rivers, chalk-cliffed islands and unforgiving deserts. The prose is unrelentingly dreamlike—no accident given that on Majipoor, dreams rule the minds of great and humble alike.