In the 3rd month of the 6th year of the `` Wadō era '' ( 713 ) , the land of Bizen '' - no kuni '' was administratively separated from Mimasaka Province ( 美作国 ) .
In 713 ( `` Wadō era 6 , 3rd month '' ) , the land of Bizen '' - no kuni '' was separated from Mimasaka Province ( 美作国 ) .