Sergyar
Sergyar is one of the three planets that comprise the Barrayaran Empire in the Vorkosigan Saga. The other planets are Barrayar and Komarr. The entire planet has been said to be the personal property of Barrayaran Emperor Gregor Vorbarra. It is the newest addition to the Barrayaran empire, and was a previously uninhabited planet with a link from Komarr to Escobar. Only seen firsthand once, well before colonization.
Read more about this topic: List Of Vorkosigan Saga Planets