The mediaeval liangjian system began to form in the Wei and Jin Dynasties, tended to systematism and codification in the North-South Dynasties, came to maturation in the Sui and Tang Dynasties.

• 中古良贱制度自魏晋时期开始形成，南北朝时期逐步系统化、法典化，至隋唐达至成熟。