As separatist movements was mounted in places dominated by the Ikuno magistrate's office, three provinces of Tajima (except for a part of northern Tajima), Harima and Mimasaka were separated from Kumihama Prefecture and formed Ikuno Prefecture in 1869.
生野代官所支配地を中心に分離運動が高まり、1869年（明治2年）、但馬（但馬北部の一部除く）、播磨、美作3ヶ国を生野県として分離した。