Prince typically refers to the son of a king or emperor.
This was both a title held by the sons and brothers of the ruling Vorbarra Emperor of the planet Barrayar and later the interstellar Barrayaran Imperium, and one held by the genomic brothers of the haut Emperor of the Cetagandan Empire. Sons of the reigning Cetagandan Emperor seem to be known as 'Prince Candidates' presumably because they are all candidates to succeed their father.
- Crown Prince Serg, the son of Emperor Ezar Vorbarra. Died in combat, never took the throne.
- Prince Xav Vorbarra, the son of Emperor Dorca Vorbarra the Just, half-brother to Mad Emperor Yuri. Barrayaran Ambassador to Beta Colony.
- Gregor Vorbarra, who was a Prince from his birth to the death of his grandfather Ezar, after which he became Emperor.
- Prince Slyke Giaja, half-brother to the Cetagandan Emperor the haut Fletchir Giaja. Governor of the satrapy Sigma Ceta.