I went back and updated this old post I wrote about Yoshimitsu. Japan is unique in that there has only been one dynasty ruling it since the beginning. Often that “ruling” was more like being kept in a golden prison by the real power that be, but still. There have, however, been several figures who may have been close to trying to completely take power and starting their own dynasty. Yoshimitsu may have been the closest to accomplishing it.

Anyway, like I said I updated the post just now. Go back and give it a read.
LINK: Ashikaga Yoshimitsu: Shogun, Sovereign, and the Dream of Dynasty