The official investiture ceremony of the Crown Prince on November 11, 1166, was said quite exceptional, because the ceremony meant that the three-year-old emperor greeted his six-year-old heir, who was his own uncle.
仁安元年（1166年）10月10日に行われた立太子の儀は、天皇が3歳、しかも甥であるのに対し、6歳の叔父が東宮に立ったわけで、非常な異例と評された。