Masayasu was the son of hatamoto Inaba Masakichi, from whom he inherited the 5000 koku territory of Aono han in 1656. He served as a page and clerk for some time, before being summoned by the shogunate to oversee irrigation projects in the provinces of Kawachi and Settsu. For this, he was awarded the post of wakadoshiyori in 1682, and had his land...