The Ise Province theory is based on that he met Prince Oama in Ise Province (explained below), and that MIYAKE no Iwatoko who had received Prince with Tanaka is considered to have been Kuninomikotomochi (provincial governor) of Ise Province.
伊勢国とするのは、後述の大海人皇子との邂逅が伊勢国であり、ともに皇子を出迎えた三宅石床が伊勢の国司と推測されるためである。