On June 12, 1864, two months before the Kinmon Incident, Imperial Prince Taruhito and his father, Imperial Prince Takahito were appointed as officials in charge of national affairs and took part in the planning politics in the Imperial Palace, since they were supporters of the Choshu Domain, they opposed Kyoto Protection official, Katamori MATSUDAIRA's close aides and supporters of the Shogun, Kuni no Miya Imperial Prince Asahiko.
禁門の変の2ヶ月前である元治元年5月9日（1864年6月12日）、熾仁親王は父・幟仁親王とともに国事御用掛に任命されて朝政に参画し、親長州派の立場から京都守護職・松平容保らの幕臣たちや、久邇宮朝彦親王ら佐幕派の皇族・公卿らと対立した。