Challenge: An Enduring Cao Wei

Your challenge is to create an enduring Cao Wei Empire in China with a POD (or several PODs) at any time prior to the death of Cao Cao in AD 220. This Empire must survive and prosper until at least the 15th century.
 
Your challenge is to create an enduring Cao Wei Empire in China with a POD (or several PODs) at any time prior to the death of Cao Cao in AD 220. This Empire must survive and prosper until at least the 15th century.

Hmm.... I'm all in favour of chocolate, but having an emperor named 'ca(o)cao':):confused:
 
Perhaps if Sima Yi is sterile. The kingdom still benefits from his brilliance, but without descendants to pass the kingdom on to, he's less likely to make the grab for power, with all the infighting and executions that leads to.

Alternatively, he actually is ill in 247 and dies before he can attempt his coup. Sima Shi either doesn't attempt the coup without his father or fails without his planning.
 
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