As the Yamato Dynasty expanded its territory, Ninokuni was divided during the Nara Period, causing Maizuru to be incorporated into Kasa-gun, Tango Province.
ヤマト王権が勢力圏を拡大すると、奈良時代に丹国は分割され、舞鶴は丹後国加佐郡に入れられた。