Nagaoka-kyō, Former imperial capital in Otokuni district, Japan.
Nagaoka-kyō is a former imperial capital in Otokuni district that occupied parts of what are now Muko and Nagaokakyo cities in Kyoto Prefecture. The site included a palace compound set on a plateau roughly fifteen meters above the surrounding plain, with planned streets and administrative buildings defining the urban grid.
Emperor Kanmu moved the capital from Heijo-kyo to this location in 784 and completed the palace and government buildings within six months. Natural disasters and political troubles, including the death of Prince Sawara, caused the city to be abandoned after only ten years.
Archaeological excavations since 1954 uncovered evidence of advanced urban planning, including wells, sewage systems, and natural spring water channels throughout residential areas.
The site lies near three major rivers and the port of Yamazakitsu, which allowed water transport and trade routes throughout the country. Archaeological excavations since 1954 have uncovered wells, drainage systems, and natural spring channels that show how residents managed daily water needs.
Natural and political troubles, including floods, diseases, and the death of Prince Sawara, led to the abandonment of Nagaoka-kyo after just ten years.
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