The majority of people living within the Cetagandan Empire were referred to as servitors, and were subordinate to the haut aristocrats and the ghem military caste.
The role of servitors on the Cetagandan planets was similar to that of the proles/plebes (i.e.non-Vor) on Barrayar. The inhabitants of planets occupied or conquered by the ghem forces presumably would be classified as servitors, including all Barrayarans during their world's occupation by the Cetagandans. A subclass of servitors was the ba caste.