647 AD: Nutari Fort was established.
648 AD: Iwafune Fort was established.
658 AD: Governor of Koshi Province Abe-no-Hirafu, with 180 vessels, conquered the Emishi of Akita and Noshiro.
701 AD: The Code of Taihō was enacted, and the government system of the ancient Japanese state was consolidated.
708 AD: Koshi Province proposed to create Dewa Province, and the central government accepted the proposal.
709 AD: Under the order of the ancient Japanese state, provincial governments contributed weapons to Ideha Fort.
710 AD: The province of Dewa was established. The counties of Mogami and Okitama in the province of Mutsu were added to the county of Dewa in the province of Koshi to form the province of Dewa.
714 AD: Two hundred families from the provinces of Owari, Kōzuke, Echizen, and Echigo migrated to Ideha Fort.
715 AD: One hundred farming families from the provinces of Shinano, Echizen, Kōzuke, and Echigo migrated to the province of Dewa.
717 AD: One hundred farming families from the provinces of Shinano, Kōzuke, Echizen, and Echigo migrated Ideha Fort.
720 AD: Moro-no-Kurao was dispatched to Makkatsu. Nihon Shoki (Chronicles of Japan) was established.
ca. 724 AD: Taga Fort was established.
727 AD: The first delegation from the state of Bohai arrived in the province of Dewa.
733 AD: Ideha Fort was moved to Takashimizu-oka in the village of Akita, and the county of Ogachi was established.
737 AD: Ōno-no-Amazubito proposed a direct route from the province to Mutsu to Ideha Fort and asked for permission to conquer the village of Ogachi.
739 AD: The 2nd delegation from the State of Bohai arrived in the province of Dewa.
746 AD: More than 1,000 people come from Bohai, but Dewa Province sent them back.
757 AD: Immoral and disobedient people were sent to the county of Monō in the province of Mutsu and to the county of Ogachi in the province of Dewa. Farmers were made migrate to Ogachi Fort.
759 AD: Monō and Ogachi Forts were constructed by imperial order. On the highway, post stations were established at Yokokawa, Ogachi, and Sukegawa. Two thousand homeless people from eight provinces in Bandō and the provinces of Echizen, Noto, and Echigo were assigned to Ogachi Fort. Armaments brought from the seven provinces of Kantō were stocked in the Monō and Ogachi Forts.
ca 760 AD: Ideha Fort was renamed Akita Fort. Criminals and slaves were liberated and assigned to Ogachi Fort. The Governor of Dewa, Ono-no-Tsukura, and the Vice-Governor, Kudara-no-Konikishi Sanchū, were promoted.
771 AD: The delegation of Bohai landed on the barbarous port of Noshiro.
775 AD: Dewa Province asked for a three-year increase in the number of fort guards. Dewa Province also asked for the relocation of the chief office (which was denied). By imperial order, soldiers from the provinces of Sagami, Musashi, Kōzuke, and Shimotsuke were sent to the province of Dewa.
777 AD: The rebellion of the Emishi people overwhelmed the army of Dewa Province.
779 AD: Three hundred and fifty-nine people from Bohai visited Japan and stayed in the province of Dewa.
780 AD: General Abe-no-Yakamaro (great grandson of Abe-no-Hirafu) of Dewa Province proposed abandoning Akita Fort. The emperor denied the recommendation and appointed a special official for the defense of Akita and Yuri Forts.
794 AD: The ancient Japanese state moved its capital city from Nara to Kyoto.
795 AD: Dewa Province reported to the central government that the Bohai delegation arrived to the village of Shiripa and were attacked by the Emishi people.
797 AD: Sakanoue Tamuramaro was appointed as a Barbarian-Subduing Generalissimo (Sei-I-Taishōgun). The Shoku-Nihongi (Continued Records of Japanese History) was established.
802 AD: Generalissimo Sakanoue constructed Isawa Fort. Rice from Echigo Province and salt from Sado Province were sent to support the guards of Ogachi Fort. Dewa Province issued an order against private trading with the barbarians of Watarishima.
804 AD: On the request of Dewa Province, the area of Akita Fort was turned in a county.
811 AD: Mutsu and Dewa Provinces received imperial permission to conquer the villages of Nisatai and Hei with 26,000 soldiers.
830 AD: Akita was hit by a great earthquake. The walls of the fort, the building, and the 5-meter Buddha statue of Shitennō Temple all collapsed.
March 29, 878 AD: The Gangyō rebellion by the Emishi people began.
April 4, 878 AD: Dewa Province requested support from Mutsu Province, which was then ordered to send soldiers.
April 28, 878 AD: Dewa Province reported being overwhelmed by the rebels. Mutsu, Kōzuke, and Shimotsuke Provinces were ordered to send soldiers.
May 4, 878 AD: Fujiwara-no-Yasunori was appointed extraordinary governor of Dewa Province.
June 7, 878 AD: Dewa Province reported on the local situation since April. The rebels requested ownership of the territory north of Akita River (Omono River). Akita Fort was again badly defeated, and the rebels seized 300 sets of armor, 700 seki of rice, 1,000 bedding sets, and 1,500 horses.
June 8, 878 AD: Ono-no-Harukaze was appointed as a general to support Akita Fort.
June 16, 878 AD: The situation in the province of Dewa worsened, and 2,000 soldiers from Mutsu Province deserted the army. Mutsu Province was ordered to send another 2,000 soldiers to support Akita Fort.
August 4, 878 AD: General Ono-no-Harukaze arrived to Kazuno through the province of Mutsu.
September 5, 878 AD: The imperial army began gaining ground, and an imperial order was issued for an early suppression of the rebels.
October 12, 878 AD: Dewa Province reported the arrival of General Ono-no-Harukaze and 2,000 soldiers from Mutsu Province to Akita Fort and asked for further instruction on the treatment of surrendered rebels.
October 13, 878 AD: An imperial order was issued for clemency for surrendered rebels.
January 11, 879 AD: Dewa Province reported the remorse of former rebels and the visit of the Emishi from Tsugaru and Watarishima. Fujiwara-no-Yasunori was promoted to Governor of Dewa Province (Dewa-no-Kami).
March 3, 879 AD: Soldiers from other provinces were allowed to return. Armies from Kōzuke and Shimotsuke were ordered to leave their weapons for Dewa Province.
June 26, 879 AD: After the soldiers from the other provinces left, the army of Dewa Province was reorganized. Akita Fort was reconstructed and reinforced.
915 AD: The province of Dewa suffered volcanic ashfall.
939 AD: A rebellion was reported. Dewa and Mutsu Provinces conscripted soldiers and prepared for combat. There was another rebellion.
1000 AD: The governor of Dewa, Fujiwara-no-Yoshimasa, was ordered to reconstruct Akita Fort.
