 The Cao family was both poetically involved in this process towards the end of the Han era and into the beginning of the subsequent Three Kingdoms era, one of which kingdoms was founded by the Cao family as dynasts.The Cao family's new state, which they called Wei, also was the base area of the Sima clan, which increased in power over time, until one of the Sima family became Emperor Wu of Jin.The early phase of this Jin dynasty, known as Western Jin, provided a unified period for China (265–316), but lacking long-term stability.