Iori entered at age 15 as a page and soon after became an official vassal. By 1632 Iori received 2500 koku and became one of Ogasawara's principal vassals.
Iori began his career in service to Ogasawara at the age of 15 as a page and quickly progressed to become a vassal. In 1632, he received significant recognition with 2500 koku and was elevated to a prominent position among Ogasawara's vassals.