Iwao Ōwa [ja] (大和岩雄) was a Japanese scholar.
In his book Jinja to kodai ōken saishi (1989). He goes on to theorize that the Ō clan (多氏, Ō no uji, also written as 大氏) was originally ōmi (大忌, "greater taboo (priesthood)"), but was usurped by the Nakatomi who were among the "lesser priesthood" (the latter claims descent from the Inbe clan (忌部氏)).[1]
Took from Takemikazuchi edit
Takemikazuchi was originally a local god (kuni-tsu-kami) revered by the Ō clan (多氏, Ō no uji, also written as 大氏),[1] and was a god of maritime travel.[1] However, the Nakatomi clan who also has roots in this region, and when they took over control of priestly duties from the Ō clan, they also instituted Takemikazuchi as the Nakatomi clan's ujigami (clan deity). Or so this is the observation by Iwao Ōwa [ja]