However, the Sengoku period saw many cases of people of lower standing overthrowing their social superiors, and during this time increasing numbers of hereditary daimyo without an official bakufu post such as shugo or shugodai (deputy shugo) began to demand official posts in order to assert the legitimacy of their control over a promise or their excursions into other provinces.
しかし、下克上が頻発した戦国時代では守護や守護代等の幕府役職者以外の出自の大名が、自国領土支配もしくは他国侵攻の正当性を主張するために任官を求める事が増加した。