is an old province of Japan lasting for a brief period of time in Nara period

Nara period

The of the history of Japan covers the years from AD 710 to 794. Empress Gemmei established the capital of Heijō-kyō . Except for 5 years , when the capital was briefly moved again, it remained the capital of Japanese civilization until Emperor Kammu established a new capital, Nagaoka-kyō, in 784...

 in what is now western Fukushima Prefecture

Fukushima Prefecture

is a prefecture of Japan located in the Tōhoku region on the island of Honshu. The capital is the city of Fukushima.-History:Until the Meiji Restoration, the area of Fukushima prefecture was known as Mutsu Province....

History

Iwase Province was created during the reign of Empress Genshō

Empress Gensho

was the 44th emperor of Japan, according to the traditional order of succession.Genshō's reign spanned the years 715 through 724.In the history of Japan, Genshō was the fifth of eight women to take on the role of empress regnant. The four female monarchs before Genshō were: Suiko, Kōgyoku/Saimei,...

. The Yōrō Ritsuryo

Ritsuryo

is the historical law system based on the philosophies of Confucianism and Chinese Legalism in Japan. The political system in accord to Ritsuryō is called "Ritsuryō-sei"...

 established the Iwase Province in 718

718

Year 718 was a common year starting on Saturday of the Julian calendar. The denomination 718 for this year has been used since the early medieval period, when the Anno Domini calendar era became the prevalent method in Europe for naming years.- Europe :* Tervel's reign as monarch of Bulgaria...

 through the division of the Michinoku Province (Mutsu Province

Mutsu Province

was an old province of Japan in the area of Fukushima, Miyagi, Iwate and Aomori prefecture and the municipalities of Kazuno and Kosaka in Akita Prefecture...

). It was composed of five districts of Shirakawa (白河), Iwase (石背), Aizu (会津), Asaka (安積) and Shinobu (信夫).

The area encompassed by the province reverted to Mutsu some time between 722

722

Year 722 was a common year starting on Thursday of the Julian calendar. The denomination 722 for this year has been used since the early medieval period, when the Anno Domini calendar era became the prevalent method in Europe for naming years.- Americas :* January 3 – K'inich Ahkal Mo' Naab...

 and 724

724

Year 724 was a leap year starting on Saturday of the Julian calendar. The denomination 724 for this year has been used since the early medieval period, when the Anno Domini calendar era became the prevalent method in Europe for naming years.- Asia :* Emperor Shōmu succeeds Empress Genshō on the...

. Some scholars have suggested that this innovation may have been motivated by economic considerations.

See also

• Iwashiro Province
  Iwashiro Province
  is an old province in the area of Fukushima Prefecture. It was sometimes called .The province occupies the western half of the central part of Fukushima Prefecture; the eastern half is Iwaki Province. More precisely, Date and Adachi Districts in the north belong to Iwashiro and Higashishirakawa and...
  
  , de facto brief reconstitution.
• List of Provinces of Japan