This article may be expanded with text translated from the corresponding article in the Japanese Wikipedia. (July 2013)
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It appears as one of the original provinces in the Nihon Shoki. In 598 AD it sent a white deer to Empress Suiko as tribute.
At the end of the 7th century it was divided into three separate provinces: Echizen, Echigo and Etchū (evidenced by Taihō Code in 701). The names of new provinces mean front-Koshi, rear-Koshi and middle-Koshi respectively that represent the distance from Kinki region when Ritsuryō system had enacted.