Soun was one of the first feudal lords who actively strengthened the rule of regional territories and ruled over Izu, although he was never officially appointed to serve as the Muromachi Shogunate's representative..
早雲は、領国支配の強化を積極的に進めた最初期の大名であり、かつ伊豆一国を支配しながら室町幕府から正式な伊豆の守護として任じられなかった。