Emperor Komei, who wished for Kobu gattai, issued an unofficial Secret Order of Bogo (Bogo was the zodiac of the year) to the Gosanke (Three Tokugawa Families just below the house of Shogun) and Gosankyo (Three Tokugawa branches besides Gosanke).
公武合体を求める孝明天皇は水戸藩はじめ御三家、御三卿などに対して戊午の密勅を下す。