The uji were not just a group of blood relatives who were formed by a natural occurrence, but were a group of blood relatives who swore vassalage to and were obliged to serve the great king.
ウジはたんに自然発生的に形成された血縁的集団ではなく、大王に臣従を誓い、奉仕することを義務づけられた血縁的集団である。