 Along with this redrawing of boundaries, present-day Fukushima Prefecture was separated from the new Mutsu Province (approximately present-day Miyagi) and split between the newly formed provinces of Iwaki in the east and Iwase in the west.However, by 724 Mutsu Province was unable to deal on its own with the economic costs of holding back the Emishi, so Iwaki and Iwase provinces were merged back into Mutsu.In the first half of the 10th century, the Date district was separated from the Shinobu district.