Many daimyo in the sengoku period were appointed to shugo by the bakufu (Japanese feudal government headed by a shogun) to establish their own legitimacy so as to surpass adjacent daimyo.
戦国大名は、支配の正統性を確立し、近隣大名を凌駕するために、幕府から守護への補任を受ける者が多かった。