In 1882, Shuzo AOKI, who had accompanied Imperial Prince Arisugawanomiya Taruhito visiting Europe, sent a letter to ITO to tell him that he felt resentful about the cold shoulder the Imperial Prince received at the place where they stayed in, different from the treatment of a member of other European royal family, and on the other hand, in 1886, Yoshitane SANNOMIYA, who had traveled with Imperial Prince Komatsunomiya Akihito spending time in Europe, also sent a letter to ITO to let him know that he was moved by the kind treatment same as a member of the other European royal family where they stopped by.
1882年に有栖川宮熾仁親王のヨーロッパ訪問に同行した青木周蔵が、伊藤に対して親王が訪問先で他の欧州王室の一員と違った冷遇を受けた事への憤慨を記した手紙を送っているが、1886年に小松宮彰仁親王のヨーロッパ訪問に同行した三宮義胤が、伊藤に対して訪問先で他の欧州王室の一員と同様の礼遇を受けた事への感慨を記した手紙を送っている。