Created in 718 A.D.
Funke, in Hitachi no Kuni Fudoki (Monumenta Nipponica), notes that the Hitachi fudoki lists Iwaki as a "district" in Michi no Oku province at some point in time before or after its short spell as a bonified "province". Funke further notes that it was "abolished...sometime between 720-728 A.D."
