The origin of this is considered to be Hakuseki ARAI's seeking Motohiro's advice on Chosen Tsushinshi (the Korean Emissary) and Diplomatic Protocol, but Motohiro went to Edo when the restart of Insei of Retired Emperor Reigen became definite from the sudden death of the Retired Emperor Higashiyama, and tried to reconstruct the relation between the Imperial Court and the bakufu, as well as to solve the establishment problem of Shin miyake (a new imperial family) (later became Kaninnomiya), which had started to formalize while Emperor Higashiyama was alive.
これは新井白石が朝鮮通信使の問題や儀礼問題について基熙の意見を求めたからだとされているが、一方、東山上皇の余りにも突然の急死により霊元上皇の院政再開が確実となったことで、基熙としても朝幕関係の再構築と東山上皇の生前の意向であった新宮家（後の閑院宮）創設問題の早期実現を願う立場から望んでいた江戸下向でもあった。