the nobility ("vlastela, vlastelinstvo" or "plemstvo") of serbia in the middle ages is roughly divided into magnates ("velikaši" or "velmože"), nobility and petty noblemen ("vlasteličići"). sometimes, the division is made between "vlastela" (including "great" and "small" ones) and "vlasteličići", the petty nobility. the lower-half social class, commoners, were the "sebri" (себри).