Why did the emperors of Wei, Jin, Southern and Northern Dynasties consolidate their imperial power and win over the nobles?

During the Cao Wei period, it was not necessary to win over aristocratic families as a ruling need. Cao Teng, the great ancestor, made his fortune and was cultivated by Cao Song, the great emperor, and Cao Cao, the emperor of Wu, and was regarded as a noble family in the late Eastern Han Dynasty.

During the Western Jin Dynasty, in order to rule the world, the royal family wooed some clans, such as giving Wei Yuan Emperor Cao Huan generous treatment, allowing him to bury his life with the emperor, and traveling according to the emperor's specifications after abdication. Thanks to his uncle Sima Yan's political practice, he won many praises from wei ren in the previous dynasty. (Although Sima Yan's usurpation of the throne made the former immigrants feel bad, it at least made them feel more or less comforted. )

Before the establishment of the Eastern Jin Dynasty, due to the chaos of the Eight Kings, five horses crossed the river and one horse was prosperous. After a series of efforts, Si Marui finally won the support of a noble family-the Wangs, so there was a saying that "Wang Ma * * * is the world".

During the Sixteen Kingdoms period, disputes in the northern world continued, and separatist regimes broke out one after another. It seems that aristocratic families didn't play much role.

During the Northern and Southern Dynasties, I didn't know much about it. Brothers are typed one by one, not copied. I am honest, and some of them don't understand. There is no point in checking Baidu. Look, I have a hard time typing. You can adopt it if you think you can! thank you