Although Iori ICHIO was goshoinban (a shogun's body guard or the castle guard) of the bakufu (Japanese feudal government headed by a shogun) and a hatamoto (direct retainers of the bakufu) in 1,000 koku (approximately 180,000 liters of crop yield; 1 koku was about 180 liter; an old unit showing volume), little is known about the details of his relationship to Sansai.
一尾伊織は幕府御書院番を務めた1000石の旗本で、三斎との経緯はよくわかっていない。