The Han dynasty fell because the idea of changing rulers spread from the people to powerful figures in Ts'ao Ts'ao's group. Weak emperors, eunuchs, empresses, and the Yellow Turbans are blamed for the decline. Efforts were made to restore the dynasty for a thousand years after its fall. The creation of the Wei dynasty was seen as illegal by some, staining its emperors with illegitimacy. In AD 338, a new Han dynasty was declared in the same city as Liu Pei's capital. Chinese dynasties were pushed southeast by non-Chinese invaders, but they believed they were the true rulers.