Due to a belief in Chinese Astrology that the 58th year of any zodiacal cycle brings great changes, on February 19, Man'en 2, the era became Bunkyū (roughly "literate story"??), that year being the 58th year of its zodiacal cycle.
During the years, when they were playing an active role, the public peace in Kyoto had deteriorated because of disturbances created by masterless samurai who, advocating loyalty to the Emperor and expulsion of foreigners, resorted to a series of assassinations of shogunate officials as well as pro-shogunate court nobles one after another.
In March of the 3rd year of Bunkyu (1863), recruitment began and such samurai as Kondo Isami and Hijikata Toshizo applied and were accepted.
By their outstanding activities at the time of the 8.18 coup in the 3rd year of Bunkyu (August 18, 1863), they were formally given the name of 'Shinsengumi' by the Imperial Court.