
On the planet of Majipoor, Valentine struggles to reclaim his birthright when he realizes that he is the true Coronal, Lord Valentine, who has been drugged, physically altered, and replaced on the throne.
All of Miles Vorkosigan books by Lois Bujold
Downbelow Station by CJ Cherryh
Stand in Zanzibar John Bruner
Adiamante - LE Modesitt Jr
Souls in the Great Machine by Sean McMullen
Known Space series by Larry Niven and ALL of his collaborations with Jerry Pournelle
Midshipman’s Hope by David Feintuch
Gateway - Fredrick Pohl
Lord Valentine’s Castle by Robert Silverberg
> Majipoor is a planet much larger, though far less dense, than the Earth. It has been settled by humans, Ghayrogs, Skandars, Vroons, Liimen, Hjorts and other alien races for many thousands of years. These races live in an unstable truce with the shape-changing aboriginal inhabitants of the planet, the Piurivar.
I don't remember the size but TVTropes says it's "ten times the size of Earth". http://tvtropes.org/pmwiki/pmwiki.php/Literature/MajipoorSer...
