(It is said to have been executed due to his strong urging, and there is a written document which includes the words "Sanshichi-sama [Nobutaka] went to Shikoku, which he had wanted to do for a long time" in the Jingu Library).
（四国征伐は信孝の強い希望によって実現したともいう。神宮文庫所蔵文書には『三七様連々お望み候四国へ・・・』との文言のある文書が存在する。）