Several main daimyo (Japanese feudal lords) who were concerned with that, such as Nariakira SHIMAZU, Yoshinaga MATSUDAIRA, and Nariaki TOKUGAWA, considered that they should put up a shogun who could deal with crises and attempted to back up Yoshinobu HITOTSUBASHI, a real son of Nariaki, as shogun, with a support of roju Masahiro ABE.
これを憂慮した島津斉彬・松平慶永・徳川斉昭ら有力な大名は大事に対応できる将軍を擁立すべきであると考えて斉昭の実子である一橋慶喜擁立に動き、老中阿部正弘もこれに加担した。